Fix pagination buttons hover z-index (#25532)

Author: MartijnCuppens

scss/_pagination.scss

@@ -15,6 +15,7 @@
   border: $pagination-border-width solid $pagination-border-color;
 
   &:hover {
+    z-index: 2;
     color: $pagination-hover-color;
     text-decoration: none;
     background-color: $pagination-hover-bg;