Force a min viewport size to scroll around the UI instead of breaking

src/playground/index.css

@@ -5,6 +5,10 @@ body,
     width: 100%; 
     height: 100%;
     margin: 0;
+
+    /* Setting min height/width makes the UI scroll below those sizes */
+    min-width: 1024px;
+    min-height: 670px; /* Min height to fit sprite/backdrop button */
 }
 
 /* @todo: move globally? Safe / side FX, for blocks particularly? */