Fix(overflow option over sticky head issue)

Author: shakti97

client/styles/components/_sketch-list.scss

@@ -19,6 +19,7 @@
   height: #{32 / $base-font-size}rem;
   position: sticky;
   top: 0;
+  z-index: 1;
   @include themify() {
     background-color: getThemifyVariable('background-color');
   }