fit canvas inside div

app.py

@@ -12,11 +12,8 @@ HTML = """
            if (xmlhttp.status == 200) {
                eval(xmlhttp.responseText);
            }
-           else if (xmlhttp.status == 400) {
-              alert("There was an error 400");
-           }
            else {
-               alert("something else other than 200 was returned");
+               alert("There was a problem fetching the wasm bindings. Try again");
            }
         }
     };