javascript - How to view this element using a browser?

Question

I can’t see this thing after I move the mouse? How to make this

Address: http://m.spider.com.cn/movie2...

Answer 1

Select its parent element or itself and check hover

Answer 2

Reference: CSS3 custom scroll bar style -webkit-scrollbar - Xuanfengge – Front-end development | web front-end technology blog

Answer 3

That’s the scroll bar.

Answer 4

That’s the scroll bar.

Answer 5

Scroll bar~~ comes with the browser
You can also rewrite the style response yourself