Convert sass files to scss files

sass/utilities/extends.scss

@@ -0,0 +1,33 @@
+@import "mixins";
+
+%control {
+  @include control;
+}
+
+%unselectable {
+  @include unselectable;
+}
+
+%arrow {
+  @include arrow;
+}
+
+%block {
+  @include block;
+}
+
+%delete {
+  @include delete;
+}
+
+%loader {
+  @include loader;
+}
+
+%overlay {
+  @include overlay;
+}
+
+%reset {
+  @include reset;
+}