Fix SASS animations

Author: dmt0

src/styles/_mixins.scss

@@ -200,22 +200,22 @@
 
 @mixin animate($type: 'fade-in', $time: 1s, $delay: 0s) {
   @if $type == 'fade-in' {
-    @extend .animate--fade-in;
+    @extend %animate--fade-in;
     animation-duration: $time;
     animation-delay: $delay;
   }
   @if $type == 'fade-out' {
-    @extend .animate--fade-out;
+    @extend %animate--fade-out;
     animation-duration: $time;
     animation-delay: $delay;
   }
   @if $type == 'fsb' {
-    @extend .animate--fade-and-slide-in-from-bottom;
+    @extend %animate--fade-and-slide-in-from-bottom;
     animation-duration: $time;
     animation-delay: $delay;
   }
   @if $type == 'fsbr' {
-    @extend .animate--fsbr;
+    @extend %animate--fsbr;
     animation-duration: $time;
     animation-delay: $delay;
   }