Take full screen if width and height are not supplied

static/js/display.js

@@ -90,6 +90,6 @@ async function getRegistration(name){
 const args = new URLSearchParams(location.search);
 init(
     args.get("name"),
-    parseInt(args.get("width")),
+    parseInt(args.get("width") || window.innerWidth),
-    parseInt(args.get("height"))
+    parseInt(args.get("height") || window.innerHeight)
 )