layout tweaks

frontend/css/style.scss

@@ -1114,7 +1114,7 @@ $rio-input-box-text-distance-from-bottom: 0.4rem; // To be aligned with the <inp
         z-index: -1;
 
         background-color: var(--outer-text-color);
-        opacity: 0.2;
+        opacity: 0.1;
 
         border-radius: var(--border-radius);
     }

rio/debug/dev_tools/sample_icons_grid.py

@@ -61,6 +61,8 @@ class SampleIconsGrid(rio.Component):
                 style="plain",
                 on_press=functools.partial(self._on_select_icon, icon),
                 key=icon,
+                align_x=0.5,
+                align_y=0.5,
             )
             for icon in DISPLAYED_ICON_NAMES
         ]