Improve contrast on dark themes

src/scss/themes/_dark.scss

@@ -2,6 +2,7 @@
   $deemphasized-color: lighten($main-bg-color, 45%);
 
   --action-button-fill-color: #{darken($deemphasized-color, 2%)};
+  --action-button-fill-color-pressed: #{lighten($main-theme-color, 5%)};
   --action-button-deemphasized-fill-color: #{$deemphasized-color};
   --action-button-deemphasized-fill-color-pressed: #{darken($deemphasized-color, 7%)};
 

src/scss/themes/ozark.scss

@@ -1,4 +1,4 @@
-$main-theme-color: #5263af;
+$main-theme-color: saturate(#5263af, 10%);
 $body-bg-color: #0f1427;
 $main-bg-color: #212433;
 $anchor-color: lighten($main-theme-color, 20%);