Ticket #36164: 36164.2.patch

src/wp-includes/css/customize-preview.css

@@ -12 +12 @@
 }
 
 .customize-render-content-error {
-        outline: solid 1px red;
+        outline: 1px solid #c62d2d;
 }
+
 .customize-render-content-error-message {
         display: block;
-        padding: 1em;
-        background-color: #FFCCCC;
+        margin-top: 5px;
+        padding: 12px 12px 12px 16px ;
+        background-color: #fff;
+        border: 1px solid #cbcdce;
+        border-left: 0;
+        -webkit-box-shadow: inset 4px 0 0 0 #dc3232;
+        box-shadow: inset 4px 0 0 0 #dc3232;
+        font-size: 13px;
+        font-weight: normal;
+        font-family: sans-serif;
+        line-height: 1.4;
+        color: #444;
+        /* hide the red outline of the parent */
+        position: relative;
+        top: 1px;
+        margin: 0 -1px;
 }