Re-add styling of buttons

Author: jissereitsma

view/frontend/web/css/source/_module.less

@@ -0,0 +1,17 @@
+& when (@media-common = true) {
+    .loki-messages {
+        button.close {
+            position: absolute;
+            top: 0;
+            bottom: 0;
+            right: 1.4rem;
+            margin: auto;
+            background: none;
+            border: none;
+            width: 1.4rem;
+            height: 1.4rem;
+            padding: 0;
+            fill: #656565;
+        }
+    }
+}