Improve display of broadcast messages

www/admin/app-admin.less

@@ -232,6 +232,19 @@
             .empty {
                 font-style: italic;
             }
+            tbody {
+                tr {
+                    background-color: @cp_support-msg-bg;
+                    border-bottom: 5px solid @cp_sidebar-right-bg;
+                    padding: 5px;
+                    td {
+                        padding: 5px;
+                        button {
+                            margin: 0 !important;
+                        }
+                    }
+                }
+            }
             .cp-notification {
                 display: flex;
                 align-items: center;