Update index.html

Author: KaneFreeman

packages/demo/src/index.html

@@ -33,7 +33,7 @@
       .CMS_Demo_root {
         background: #0f172a;
         display: flex;
-        height: 100vh;
+        height: 100dvh;
         flex-direction: column;
         align-items: center;
         justify-content: center;