(fix): update social button styling

Author: neelbrahma

src/scss/custom/_demo.scss

@@ -138,9 +138,11 @@
   // social button share (addthis)
   .addthis-smartlayers {
     .at-share-btn {
-      &:hover {
-        border-top-right-radius: $border-radius;
-        border-bottom-right-radius: $border-radius;
+      @include media-breakpoint-up(lg) {
+        &:hover {
+          border-top-right-radius: $border-radius;
+          border-bottom-right-radius: $border-radius;
+        }
       }
       &:focus {
         outline: none;