Clip masks complete

assets/main.rml

@@ -5,7 +5,8 @@
   </head>
   <body>
     <h1>Hello from RmlUi</h1>
-    <div style="position:absolute; top: 0; left: 0; width: 200px; height: 100px; background-color: rgba(255, 0, 0, 128); transform: rotate(15deg) translate(50px,0) scale(0.8)">
+    <div style="position: relative; width: 300px; height: 200px; overflow: hidden; border-radius: 40px; background-color: #0000ff">
+      <div style="position: absolute; top: -20px; left: -20px; width: 150px; height: 150px; background-color: #ff0000; transform: rotate(15deg);"></div>
     </div>
   </body>
 </rml>