Add right margin of notification message (#7628)

app/javascript/styles/mastodon/components.scss

@@ -1373,9 +1373,8 @@ a.account__display-name {
 }
 
 .notification__message {
-  margin-left: 68px;
-  padding: 8px 0;
-  padding-bottom: 0;
+  margin: 0 10px 0 68px;
+  padding: 8px 0 0;
   cursor: default;
   color: $darker-text-color;
   font-size: 15px;