minor styles adjustments

ui/src/scss/_base.scss

@@ -581,8 +581,8 @@ a.thumb:not(.thumb-active) {
         @include shadowize(0px 2px 4px 1px var(--shadowColor));
     }
     &:active {
-        transition-duration: 0s;
-        transform: scale(0.95);
+        transition-duration: var(--activeAnimationSpeed);
+        transform: scale(0.97);
     }
 }
 

ui/src/scss/_file_picker.scss

@@ -53,8 +53,6 @@
         cursor: pointer;
         outline: 0;
         transition: box-shadow var(--baseAnimationSpeed);
-        &:hover {
-        }
     }
 }