Issue #3045140 by tonytheferg, BhumikaVarshney, VladimirAus: Add ability to close messages

templates/misc/status-messages.html.twig

@@ -35,6 +35,9 @@
     ]
   %}
   <div aria-label="{{ status_headings[type] }}"{{ attributes.addClass(classes)|without('aria-label') }} role="alert">
+    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
+      <span aria-hidden="true">&times;</span>
+    </button>
     {% if status_headings[type] %}
       <h2 class="visually-hidden">{{ status_headings[type] }}</h2>
     {% endif %}