diff --git a/skins/elastic/styles/widgets/buttons.less b/skins/elastic/styles/widgets/buttons.less
index 3d55ef1d4..826cc7fd9 100644
--- a/skins/elastic/styles/widgets/buttons.less
+++ b/skins/elastic/styles/widgets/buttons.less
@@ -73,9 +73,19 @@ button.btn {
     &.restore:before {
         content: @fa-var-undo;
     }
+    &.send:before {
+        content: @fa-var-paper-plane;
+    }
+    &.attach:before {
+        content: @fa-var-paperclip;
+    }
+    &.close:before,
     &.cancel:before {
         content: @fa-var-close;
     }
+    &.mark:before {
+        /* TODO: "Mark all as read" icon */
+    }
 }
 
 a.button.icon {