fix expand button style on mobile

ui/component/common/card.jsx

@@ -47,7 +47,7 @@ export default function Card(props: Props) {
             </div>
           </div>
           {expandable && (
-            <div className="section--padded">
+            <div className="card__expand-btn">
               <Button
                 button={'alt'}
                 aria-label={__('More')}

ui/scss/component/_card.scss

@@ -227,6 +227,14 @@
   }
 }
 
+.card__expand-btn {
+  padding: var(--spacing-medium);
+
+  @media (max-width: $breakpoint-small) {
+    padding: 0;
+  }
+}
+
 .card__header,
 .card__body,
 .card__main-actions {