Django 2.0 CSS missing for chrome browser

I'm learning Django2.0 these days and tried the tutorial here. However, when it comes to the admin page part, the css style seems missing in Chrome browser:

However, when I visited 127.0.0.1:8000/admin in IE, Firefox or even Safari, everything went fine:

I'm using the latest version of Chrome.

Why? What can I do to fix this?