Add highlight to open page tab

src/style/mixins.scss

@@ -33,22 +33,6 @@ $breakpoint-width: 600px !default;
   }
 }
 
-@mixin image-button($background-image, $background-color) {
-  @include square(var(--icon-size));
-  border: none;
-  cursor: pointer;
-
-  background-color: $background-color;
-  mask-image: $background-image;
-  -webkit-mask-image: $background-image;
-  mask-repeat: no-repeat;
-
-  transition: transform var(--transition-time), background-color var(--transition-time);
-  &:hover {
-    transform: scale(1.15);
-  }
-}
-
 @mixin center-children() {
   display: flex;
   align-items: center;

src/style/vars.scss

@@ -19,7 +19,7 @@
   --normal-margin: 2rem;
   --small-margin: 1rem;
   --shadow: 0 0 5px 2px rgba(0, 0, 0, 0.15), 0 0 1px rgba(0, 0, 0, 0.2);
-  --icon-size: 2.8rem;
+  --icon-size: 2.5rem;
   --large-icon-size: 3.75rem;
   --body-width: min(80%, 60rem);
 }
@@ -29,5 +29,6 @@
     --body-width: 90%;
     --large-margin: 2.8rem;
     --normal-margin: 2rem;
+    --icon-size: 2rem;
   }
 }