diff --git a/rio/__init__.py b/rio/__init__.py
index 37f1705a..e9b4afaf 100644
--- a/rio/__init__.py
+++ b/rio/__init__.py
@@ -16,7 +16,7 @@ from . import event as event
 from . import patches_for_3rd_party_stuff
 from .app import *
 from .color import *
-from .common import *
+from .utils import *
 from .components import *
 from .cursor_style import *
 from .errors import *
diff --git a/rio/app.py b/rio/app.py
index ddb290bb..badf2be1 100644
--- a/rio/app.py
+++ b/rio/app.py
@@ -15,8 +15,8 @@ import uvicorn
 
 import rio
 
-from . import app_server, assets, common, debug, maybes
-from .common import ImageLike
+from . import app_server, assets, debug, maybes, utils
+from .utils import ImageLike
 
 
 __all__ = [
@@ -224,7 +224,7 @@ class App:
             name = _get_default_app_name(main_file)
 
         if icon is None:
-            icon = common.HOSTED_ASSETS_DIR / "rio-logos/rio-logo-square.png"
+            icon = utils.HOSTED_ASSETS_DIR / "rio-logos/rio-logo-square.png"
 
         if build is None:
             build = rio.PageView
@@ -328,7 +328,7 @@ class App:
         Internal equivalent of `run_as_web_server` that takes additional
         arguments.
         """
-        port = common.ensure_valid_port(host, port)
+        port = utils.ensure_valid_port(host, port)
 
         # Suppress stdout messages if requested
         kwargs = {}
@@ -443,7 +443,7 @@ class App:
         quiet: If `True` Rio won't send any routine messages to `stdout`.
             Error messages will be printed regardless of this setting.
         """
-        port = common.ensure_valid_port(host, port)
+        port = utils.ensure_valid_port(host, port)
 
         def on_startup() -> None:
             webbrowser.open(f"http://{host}:{port}")
@@ -504,7 +504,7 @@ class App:
         # it down when the window is closed.
 
         host = "localhost"
-        port = common.ensure_valid_port(host, None)
+        port = utils.ensure_valid_port(host, None)
         url = f"http://{host}:{port}"
 
         # This lock is released once the server is running
diff --git a/rio/app_server.py b/rio/app_server.py
index 3813aae9..14e9d053 100644
--- a/rio/app_server.py
+++ b/rio/app_server.py
@@ -28,7 +28,6 @@ from . import (
     app,
     assets,
     byte_serving,
-    common,
     components,
     debug,
     global_state,
@@ -36,8 +35,9 @@ from . import (
     routing,
     session,
     user_settings_module,
+    utils,
 )
-from .common import URL
+from .utils import URL
 from .components.root_components import HighLevelRootComponent
 from .errors import AssetError
 from .serialization import serialize_json
@@ -95,7 +95,7 @@ def read_frontend_template(template_name: str) -> str:
     Read a text file from the frontend directory and return its content. The
     results are cached to avoid repeated disk access.
     """
-    return (common.GENERATED_DIR / template_name).read_text(encoding="utf-8")
+    return (utils.GENERATED_DIR / template_name).read_text(encoding="utf-8")
 
 
 class InitialClientMessage(uniserde.Serde):
@@ -181,7 +181,7 @@ class AppServer(fastapi.FastAPI):
         # All pending file uploads. These are stored in memory for a limited
         # time. When a file is uploaded the corresponding future is set.
         self._pending_file_uploads: timer_dict.TimerDict[
-            str, asyncio.Future[list[common.FileInfo]]
+            str, asyncio.Future[list[utils.FileInfo]]
         ] = timer_dict.TimerDict(default_duration=timedelta(minutes=15))
 
         # FastAPI
@@ -519,14 +519,14 @@ Sitemap: {request_url.with_path("/rio/sitemap")}
         # Well known asset?
         if not asset_id.startswith("temp-"):
             # Construct the path to the target file
-            asset_file_path = common.HOSTED_ASSETS_DIR / asset_id
+            asset_file_path = utils.HOSTED_ASSETS_DIR / asset_id
 
             # Make sure the path is inside the hosted assets directory
             #
             # TODO: Is this safe? Would this allow the client to break out from
             # the directory using tricks such as "../", links, etc?
             asset_file_path = asset_file_path.resolve()
-            if common.HOSTED_ASSETS_DIR not in asset_file_path.parents:
+            if utils.HOSTED_ASSETS_DIR not in asset_file_path.parents:
                 logging.warning(
                     f'Client requested asset "{asset_id}" which is not located inside the hosted assets directory. Somebody might be trying to break out of the assets directory!'
                 )
@@ -635,7 +635,7 @@ Sitemap: {request_url.with_path("/rio/sitemap")}
         # Complete the future
         future.set_result(
             [
-                common.FileInfo(
+                utils.FileInfo(
                     name=file_names[ii],
                     size_in_bytes=parsed_file_sizes[ii],
                     media_type=file_types[ii],
@@ -920,7 +920,7 @@ Sitemap: {request_url.with_path("/rio/sitemap")}
 
         # Is this a page, or a full URL to another site?
         try:
-            common.make_url_relative(
+            utils.make_url_relative(
                 sess._base_url,
                 active_page_url_absolute,
             )
diff --git a/rio/assets.py b/rio/assets.py
index 4a42724e..386eabc1 100644
--- a/rio/assets.py
+++ b/rio/assets.py
@@ -14,7 +14,7 @@ from yarl import URL
 
 import rio
 
-from .common import ImageLike
+from .utils import ImageLike
 from .self_serializing import SelfSerializing
 
 
diff --git a/rio/cli/run_project/arbiter.py b/rio/cli/run_project/arbiter.py
index a395b310..59a9c9cb 100644
--- a/rio/cli/run_project/arbiter.py
+++ b/rio/cli/run_project/arbiter.py
@@ -16,7 +16,7 @@ import rio.cli
 import rio.icon_registry
 import rio.snippets
 
-from ... import common
+from ... import utils
 from ...debug.monkeypatches import apply_monkeypatches
 from .. import nice_traceback, project
 from . import (
@@ -104,10 +104,10 @@ class Arbiter:
         # to connect to - this way old browser tabs don't get invalidated
         # constantly.
         if port is None:
-            if common.port_is_free(self._host, 8000):
+            if utils.port_is_free(self._host, 8000):
                 self.port = 8000
             else:
-                self.port = common.choose_free_port(self._host)
+                self.port = utils.choose_free_port(self._host)
         else:
             self.port = port
 
diff --git a/rio/components/fundamental_component.py b/rio/components/fundamental_component.py
index a4e4736b..7812fa1d 100644
--- a/rio/components/fundamental_component.py
+++ b/rio/components/fundamental_component.py
@@ -7,7 +7,7 @@ from uniserde import Jsonable, JsonDoc
 
 import rio
 
-from .. import common, inspection
+from .. import inspection, utils
 from .component import Component
 
 __all__ = [
@@ -88,7 +88,7 @@ class FundamentalComponent(Component):
     def __init_subclass__(cls):
         # Assign a unique id to this class. This allows the frontend to identify
         # components.
-        hash_ = common.secure_string_hash(
+        hash_ = utils.secure_string_hash(
             cls.__module__,
             cls.__qualname__,
             hash_length=12,
diff --git a/rio/components/image.py b/rio/components/image.py
index 7cafff7f..abebf696 100644
--- a/rio/components/image.py
+++ b/rio/components/image.py
@@ -6,7 +6,7 @@ from typing import Literal, final
 from uniserde import Jsonable, JsonDoc
 
 from .. import assets
-from ..common import EventHandler, ImageLike
+from ..utils import EventHandler, ImageLike
 from .fundamental_component import FundamentalComponent
 
 __all__ = ["Image"]
diff --git a/rio/components/media_player.py b/rio/components/media_player.py
index a743b1e1..a96c3378 100644
--- a/rio/components/media_player.py
+++ b/rio/components/media_player.py
@@ -8,7 +8,7 @@ from uniserde import JsonDoc
 import rio
 
 from .. import assets, color
-from ..common import EventHandler
+from ..utils import EventHandler
 from .fundamental_component import KeyboardFocusableFundamentalComponent
 
 __all__ = ["MediaPlayer"]
diff --git a/rio/components/page_view.py b/rio/components/page_view.py
index e448dc7e..8285eca0 100644
--- a/rio/components/page_view.py
+++ b/rio/components/page_view.py
@@ -6,7 +6,7 @@ from typing import *  # type: ignore
 
 import rio
 
-from .. import common
+from .. import utils
 from .component import Component
 
 __all__ = [
@@ -163,10 +163,10 @@ class PageView(Component):
             if self.fallback_build is None:
                 result = default_fallback_build(self.session)
             else:
-                result = common.safe_build(self.fallback_build)
+                result = utils.safe_build(self.fallback_build)
                 result._rio_internal_ = False
         else:
-            result = common.safe_build(page.build)
+            result = utils.safe_build(page.build)
             result._rio_internal_ = False
 
         return result
diff --git a/rio/components/root_components.py b/rio/components/root_components.py
index 5e74d6aa..dbaede83 100644
--- a/rio/components/root_components.py
+++ b/rio/components/root_components.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 from collections.abc import Callable
 from typing import *  # type: ignore
 
-from .. import common
+from .. import utils
 from .component import Component
 from .fundamental_component import FundamentalComponent
 from .scroll_container import ScrollContainer
@@ -41,11 +41,11 @@ class HighLevelRootComponent(Component):
 
         # User content should automatically scroll if it grows too large, so we
         # wrap it in a ScrollContainer
-        user_content = ScrollContainer(common.safe_build(self.build_function))
+        user_content = ScrollContainer(utils.safe_build(self.build_function))
 
         return FundamentalRootComponent(
             user_content,
-            common.safe_build(self.build_connection_lost_message_function),
+            utils.safe_build(self.build_connection_lost_message_function),
             debugger=debugger,
         )
 
diff --git a/rio/components/website.py b/rio/components/website.py
index d4e95cfc..2639fcdb 100644
--- a/rio/components/website.py
+++ b/rio/components/website.py
@@ -1,6 +1,6 @@
 from typing import final
 
-from ..common import URL
+from ..utils import URL
 from .fundamental_component import FundamentalComponent
 
 __all__ = [
diff --git a/rio/debug/dev_tools/component_details.py b/rio/debug/dev_tools/component_details.py
index f22e0e64..28735110 100644
--- a/rio/debug/dev_tools/component_details.py
+++ b/rio/debug/dev_tools/component_details.py
@@ -4,7 +4,7 @@ from typing import *  # type: ignore
 import rio
 import rio.docs
 
-from ... import common
+from ... import utils
 
 
 class ComponentDetails(rio.Component):
@@ -55,25 +55,25 @@ class ComponentDetails(rio.Component):
 
     def _get_effective_margins(self) -> Tuple[float, float, float, float]:
         return (
-            common.first_non_null(
+            utils.first_non_null(
                 self.margin_left,
                 self.margin_x,
                 self.margin,
                 0,
             ),
-            common.first_non_null(
+            utils.first_non_null(
                 self.margin_top,
                 self.margin_y,
                 self.margin,
                 0,
             ),
-            common.first_non_null(
+            utils.first_non_null(
                 self.margin_right,
                 self.margin_x,
                 self.margin,
                 0,
             ),
-            common.first_non_null(
+            utils.first_non_null(
                 self.margin_bottom,
                 self.margin_y,
                 self.margin,
diff --git a/rio/fills.py b/rio/fills.py
index 15b51d9f..4ab9095f 100644
--- a/rio/fills.py
+++ b/rio/fills.py
@@ -11,7 +11,7 @@ import rio
 
 from . import assets
 from .color import Color
-from .common import ImageLike
+from .utils import ImageLike
 from .self_serializing import SelfSerializing
 
 __all__ = [
diff --git a/rio/icon_registry.py b/rio/icon_registry.py
index 4ed6d1f1..d09acea5 100644
--- a/rio/icon_registry.py
+++ b/rio/icon_registry.py
@@ -5,7 +5,7 @@ import tarfile
 from pathlib import Path
 from typing import *  # type: ignore
 
-from . import common
+from . import utils
 from .errors import AssetError
 
 _icon_registry: IconRegistry | None = None
@@ -40,15 +40,15 @@ class IconRegistry:
 
             # Register built-in icon sets
             _icon_registry.icon_set_archives["material"] = (
-                common.RIO_ASSETS_DIR / "icon-sets" / "material.tar.xz"
+                utils.RIO_ASSETS_DIR / "icon-sets" / "material.tar.xz"
             )
 
             _icon_registry.icon_set_archives["rio"] = (
-                common.RIO_ASSETS_DIR / "icon-sets" / "rio.tar.xz"
+                utils.RIO_ASSETS_DIR / "icon-sets" / "rio.tar.xz"
             )
 
             _icon_registry.icon_set_archives["styling"] = (
-                common.RIO_ASSETS_DIR / "icon-sets" / "styling.tar.xz"
+                utils.RIO_ASSETS_DIR / "icon-sets" / "styling.tar.xz"
             )
 
         # Use it
@@ -107,7 +107,7 @@ class IconRegistry:
         Given the name of an icon set, return the directory where the icon set
         will be extracted to. The directory will be created if necessary.
         """
-        return common.ASSET_MANGER.get_cache_path(
+        return utils.ASSET_MANGER.get_cache_path(
             Path("icon-sets") / icon_set,
         )
 
diff --git a/rio/routing.py b/rio/routing.py
index e2bc0900..89f86f36 100644
--- a/rio/routing.py
+++ b/rio/routing.py
@@ -7,7 +7,7 @@ from typing import final
 
 import rio
 
-from . import common
+from . import utils
 from .errors import NavigationFailed
 
 __all__ = ["Page"]
@@ -176,7 +176,7 @@ def check_page_guards(
     while True:
         # TODO: What if the URL is not a child of the base URL? i.e. redirecting
         #   to a completely different site
-        target_url_relative = common.make_url_relative(
+        target_url_relative = utils.make_url_relative(
             sess._base_url, target_url_absolute
         )
 
diff --git a/rio/session.py b/rio/session.py
index a27b1f00..74d021e4 100644
--- a/rio/session.py
+++ b/rio/session.py
@@ -30,7 +30,6 @@ import rio
 from . import (
     app_server,
     assets,
-    common,
     errors,
     global_state,
     inspection,
@@ -39,6 +38,7 @@ from . import (
     text_style,
     theme,
     user_settings_module,
+    utils,
 )
 from .components import fundamental_component, root_components
 from .state_properties import AttributeBinding
@@ -474,13 +474,13 @@ class Session(unicall.Unicall):
 
     @overload
     async def _call_event_handler(
-        self, handler: common.EventHandler[[]], *, refresh: bool
+        self, handler: utils.EventHandler[[]], *, refresh: bool
     ) -> None: ...
 
     @overload
     async def _call_event_handler(
         self,
-        handler: common.EventHandler[[T]],
+        handler: utils.EventHandler[[T]],
         event_data: T,
         /,
         *,
@@ -489,7 +489,7 @@ class Session(unicall.Unicall):
 
     async def _call_event_handler(
         self,
-        handler: common.EventHandler[...],
+        handler: utils.EventHandler[...],
         *event_data: object,
         refresh: bool,
     ) -> None:
@@ -522,20 +522,20 @@ class Session(unicall.Unicall):
     @overload
     def _call_event_handler_sync(
         self,
-        handler: common.EventHandler[[]],
+        handler: utils.EventHandler[[]],
     ) -> None: ...
 
     @overload
     def _call_event_handler_sync(
         self,
-        handler: common.EventHandler[[T]],
+        handler: utils.EventHandler[[T]],
         event_data: T,
         /,
     ) -> None: ...
 
     def _call_event_handler_sync(
         self,
-        handler: common.EventHandler[...],
+        handler: utils.EventHandler[...],
         *event_data: object,
     ) -> None:
         """
@@ -638,7 +638,7 @@ class Session(unicall.Unicall):
 
         # Is this a page, or a full URL to another site?
         try:
-            common.make_url_relative(
+            utils.make_url_relative(
                 self._base_url,
                 target_url_absolute,
             )
@@ -806,7 +806,7 @@ window.history.{method}(null, "", {json.dumps(str(active_page_url))})
             global_state.currently_building_component = component
             global_state.currently_building_session = self
 
-            build_result = common.safe_build(component.build)
+            build_result = utils.safe_build(component.build)
 
             global_state.currently_building_component = None
             global_state.currently_building_session = None
@@ -1760,7 +1760,7 @@ window.history.{method}(null, "", {json.dumps(str(active_page_url))})
         *,
         file_extensions: Iterable[str] | None = None,
         multiple: Literal[False] = False,
-    ) -> common.FileInfo: ...
+    ) -> utils.FileInfo: ...
 
     @overload
     async def file_chooser(
@@ -1768,14 +1768,14 @@ window.history.{method}(null, "", {json.dumps(str(active_page_url))})
         *,
         file_extensions: Iterable[str] | None = None,
         multiple: Literal[True],
-    ) -> tuple[common.FileInfo, ...]: ...
+    ) -> tuple[utils.FileInfo, ...]: ...
 
     async def file_chooser(
         self,
         *,
         file_extensions: Iterable[str] | None = None,
         multiple: bool = False,
-    ) -> common.FileInfo | tuple[common.FileInfo, ...]:
+    ) -> utils.FileInfo | tuple[utils.FileInfo, ...]:
         """
         Open a file chooser dialog.
 
@@ -1799,7 +1799,7 @@ window.history.{method}(null, "", {json.dumps(str(active_page_url))})
         """
         # Create a secret id and register the file upload with the app server
         upload_id = secrets.token_urlsafe()
-        future = asyncio.Future[list[common.FileInfo]]()
+        future = asyncio.Future[list[utils.FileInfo]]()
 
         self._app_server._pending_file_uploads[upload_id] = future
 
diff --git a/rio/snippets/__init__.py b/rio/snippets/__init__.py
index 0547bc64..8df8bade 100644
--- a/rio/snippets/__init__.py
+++ b/rio/snippets/__init__.py
@@ -11,7 +11,7 @@ from typing import *  # type: ignore
 
 import uniserde
 
-from .. import common
+from .. import utils
 
 SECTION_PATTERN = re.compile(r" *#\s*<(\/?[\w-]+)>")
 
@@ -188,7 +188,7 @@ def _get_all_snippet_paths() -> dict[str, dict[str, Path]]:
 
     # Scan all snippet directories. The first directory is used as a key, the
     # rest just for organization.
-    for group_dir in common.SNIPPETS_DIR.iterdir():
+    for group_dir in utils.SNIPPETS_DIR.iterdir():
         assert group_dir.is_dir(), group_dir
         scan_dir_recursively(group_dir.name, group_dir)
 
diff --git a/rio/text_style.py b/rio/text_style.py
index 77c5d5a0..161c3166 100644
--- a/rio/text_style.py
+++ b/rio/text_style.py
@@ -8,7 +8,7 @@ from uniserde import JsonDoc
 
 import rio
 
-from . import common
+from . import utils
 from .fills import FillLike
 from .self_serializing import SelfSerializing
 
@@ -67,17 +67,17 @@ class Font(SelfSerializing):
 
 
 Font.ROBOTO = Font(
-    regular=common.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-Regular.ttf",
-    bold=common.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-Bold.ttf",
-    italic=common.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-Italic.ttf",
-    bold_italic=common.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-BoldItalic.ttf",
+    regular=utils.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-Regular.ttf",
+    bold=utils.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-Bold.ttf",
+    italic=utils.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-Italic.ttf",
+    bold_italic=utils.RIO_ASSETS_DIR / "fonts/Roboto/Roboto-BoldItalic.ttf",
 )
 
 Font.ROBOTO_MONO = Font(
-    regular=common.RIO_ASSETS_DIR / "fonts/Roboto Mono/RobotoMono-Regular.ttf",
-    bold=common.RIO_ASSETS_DIR / "fonts/Roboto Mono/RobotoMono-Bold.ttf",
-    italic=common.RIO_ASSETS_DIR / "fonts/Roboto Mono/RobotoMono-Italic.ttf",
-    bold_italic=common.RIO_ASSETS_DIR
+    regular=utils.RIO_ASSETS_DIR / "fonts/Roboto Mono/RobotoMono-Regular.ttf",
+    bold=utils.RIO_ASSETS_DIR / "fonts/Roboto Mono/RobotoMono-Bold.ttf",
+    italic=utils.RIO_ASSETS_DIR / "fonts/Roboto Mono/RobotoMono-Italic.ttf",
+    bold_italic=utils.RIO_ASSETS_DIR
     / "fonts/Roboto Mono/RobotoMono-BoldItalic.ttf",
 )
 
@@ -133,7 +133,9 @@ class TextStyle(SelfSerializing):
             fill=self.fill if isinstance(fill, UnsetType) else fill,
             font_size=self.font_size if font_size is None else font_size,
             italic=self.italic if italic is None else italic,
-            font_weight=self.font_weight if font_weight is None else font_weight,
+            font_weight=self.font_weight
+            if font_weight is None
+            else font_weight,
             underlined=self.underlined if underlined is None else underlined,
             all_caps=self.all_caps if all_caps is None else all_caps,
         )
diff --git a/rio/theme.py b/rio/theme.py
index f53215df..e56ef30a 100644
--- a/rio/theme.py
+++ b/rio/theme.py
@@ -8,7 +8,7 @@ from uniserde import Jsonable
 
 import rio
 
-from . import color, common
+from . import color, utils
 from . import text_style as text_style_module
 
 __all__ = [
@@ -139,14 +139,14 @@ class Palette:
         foreground: rio.Color | None = None,
     ) -> Palette:
         return Palette(
-            background=common.first_non_null(background, self.background),
-            background_variant=common.first_non_null(
+            background=utils.first_non_null(background, self.background),
+            background_variant=utils.first_non_null(
                 background_variant, self.background_variant
             ),
-            background_active=common.first_non_null(
+            background_active=utils.first_non_null(
                 background_active, self.background_active
             ),
-            foreground=common.first_non_null(foreground, self.foreground),
+            foreground=utils.first_non_null(foreground, self.foreground),
         )
 
 
@@ -738,54 +738,54 @@ class Theme:
         text_style: rio.TextStyle | None = None,
     ) -> Theme:
         return Theme._create_new(
-            primary_palette=common.first_non_null(
+            primary_palette=utils.first_non_null(
                 primary_palette, self.primary_palette
             ),
-            secondary_palette=common.first_non_null(
+            secondary_palette=utils.first_non_null(
                 secondary_palette, self.secondary_palette
             ),
-            background_palette=common.first_non_null(
+            background_palette=utils.first_non_null(
                 background_palette, self.background_palette
             ),
-            neutral_palette=common.first_non_null(
+            neutral_palette=utils.first_non_null(
                 neutral_palette, self.neutral_palette
             ),
-            hud_palette=common.first_non_null(hud_palette, self.hud_palette),
-            disabled_palette=common.first_non_null(
+            hud_palette=utils.first_non_null(hud_palette, self.hud_palette),
+            disabled_palette=utils.first_non_null(
                 disabled_palette, self.disabled_palette
             ),
-            success_palette=common.first_non_null(
+            success_palette=utils.first_non_null(
                 success_palette, self.success_palette
             ),
-            warning_palette=common.first_non_null(
+            warning_palette=utils.first_non_null(
                 warning_palette, self.warning_palette
             ),
-            danger_palette=common.first_non_null(
+            danger_palette=utils.first_non_null(
                 danger_palette, self.danger_palette
             ),
-            corner_radius_small=common.first_non_null(
+            corner_radius_small=utils.first_non_null(
                 corner_radius_small, self.corner_radius_small
             ),
-            corner_radius_medium=common.first_non_null(
+            corner_radius_medium=utils.first_non_null(
                 corner_radius_medium, self.corner_radius_medium
             ),
-            corner_radius_large=common.first_non_null(
+            corner_radius_large=utils.first_non_null(
                 corner_radius_large, self.corner_radius_large
             ),
-            shadow_color=common.first_non_null(shadow_color, self.shadow_color),
-            monospace_font=common.first_non_null(
+            shadow_color=utils.first_non_null(shadow_color, self.shadow_color),
+            monospace_font=utils.first_non_null(
                 monospace_font, self.monospace_font
             ),
-            heading1_style=common.first_non_null(
+            heading1_style=utils.first_non_null(
                 heading1_style, self.heading1_style
             ),
-            heading2_style=common.first_non_null(
+            heading2_style=utils.first_non_null(
                 heading2_style, self.heading2_style
             ),
-            heading3_style=common.first_non_null(
+            heading3_style=utils.first_non_null(
                 heading3_style, self.heading3_style
             ),
-            text_style=common.first_non_null(text_style, self.text_style),
+            text_style=utils.first_non_null(text_style, self.text_style),
         )
 
     @property
diff --git a/rio/common.py b/rio/utils.py
similarity index 100%
rename from rio/common.py
rename to rio/utils.py
diff --git a/scripts/build_material_icon_set.py b/scripts/build_material_icon_set.py
index a9005411..8637fd5e 100644
--- a/scripts/build_material_icon_set.py
+++ b/scripts/build_material_icon_set.py
@@ -25,7 +25,7 @@ SET_NAME = "material"
 #
 # Repo URL: https://github.com/marella/material-symbols
 INPUT_DIR = (
-    rio.common.PROJECT_ROOT_DIR
+    rio.utils.PROJECT_ROOT_DIR
     / "thirdparty"
     / "material-symbols"
     / "svg"
@@ -39,7 +39,7 @@ INPUT_NAME_PATTERN = r"(.+).svg"
 
 # Configure: The output file will be written into this directory as
 # <SET_NAME>.tar.xz
-OUTPUT_DIR = rio.common.RIO_ASSETS_DIR / "icon-sets"
+OUTPUT_DIR = rio.utils.RIO_ASSETS_DIR / "icon-sets"
 
 # For debugging: Stop after processing this many icons. Set to `None` for no
 # limit