My first Cesium app gives me just a white blank page.

1. A concise explanation of the problem you're experiencing.
I copied the codes of the first app which is at the link below but it gives me a blank white page; nothing in it. I have run it on multiple computers and with multiple browsers but the results are the same. My access token is already there in the template, so I have nothing to do but just copying and pasting it to glitch. But it won't let me get it.

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.

<!DOCTYPE html>
<html lang="en">
<head>
  <script src="https://cesiumjs.org/releases//Build/Cesium/Cesium.js"></script>
  <link href="https://cesiumjs.org/releases//Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
  <div id="cesiumContainer" style="width: 700px; height:400px"></div>
  <script>
    Cesium.Ion.defaultAccessToken = 'MY ACCESS TOKEN';
    var viewer = new Cesium.Viewer('cesiumContainer');
  </script>
</body>
</html>

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
Just want to build my first app by following the tutorial.

4. The Cesium version you're using, your operating system and browser.
I didn't think I need to install Cesium because the codes above do not refer to my own Cesium.

It looks like those links are missing a version number! If you replace:

https://cesiumjs.org/releases//Build/Cesium/Cesium.js

With

https://cesiumjs.org/releases/1.51/Build/Cesium/Cesium.js

It should work. The tutorial is supposed to auto-generate the new version number and put it there with each release, so this must have recently broken. Thanks for reporting this, I’ll see if I can get it fixed right away.

Let me know if you run into any other issues, and welcome to Cesium!

This should be fixed now!

Yay! Now it's working! Thank you very much Omar!