fepper-3490177: On Mobile view, Add new comment - subject input box needs to be styled and in full width.

_styles/bld/style.css

@@ -1203,3 +1203,11 @@ section[rel="schema:comment"] .indented {
     display: none;
   }
 }
+.comment-form .field--name-subject input {
+  border-color: #ccced1;
+}
+@media (max-width: 767px) {
+  .comment-form .field--name-subject input {
+    width: 100%;
+  }
+}