Styles: add root IFrame style

app/static/css/styles.css

@@ -5,6 +5,13 @@ html {
     margin: 0;
 }
 
+.root-frame{
+    width: 100vw;
+    height: 100vh;
+    border: none;
+    display: block;
+}
+
 .polygon-draw {
     align-items: center;
     width: auto;