Issue #3392893: Image field is extending out of view port in mobile view

css/components/form.css

@@ -102,3 +102,8 @@ abbr.ajax-changed {
   background: url(../../images/core/error.svg) no-repeat;
   background-size: contain;
 }
+
+/* Changes for 3392893 */
+form .field--name-field-image .form-text {
+  width: 100%;
+}