[CSS] Note actions size further compatibility work.

public/assets/default_theme/css/pages/feeds.css

@@ -82,11 +82,18 @@
 }
 .button-container {
     border: none !important;
+    -webkit-border-radius: unset !important;
+    -moz-border-radius: unset !important;
     border-radius: unset !important;
+    -webkit-mask-repeat: no-repeat !important;
+    mask-repeat: no-repeat !important;
+    -webkit-mask-size: cover !important;
+    mask-size: cover !important;
     margin-left: 0.6rem;
     width: 1rem;
     height: 1rem;
 }
+}
 .button-container:hover,
 .button-container:focus {
     border: none !important