Different user's level popup is overlapping together

[MrOrz]

Despite the fact that cofacts/rumors-api#95 is fixed by @nonumpa 's cofacts/rumors-api#123, the user level display is still incorrect.

Seems that all user's level popups are all overlapping together.

Example: https://cofacts.g0v.tw/article/3qlrkscnnx950

It's a good first issue I think.

[nonumpa]

According to the meeting note : use balloon.css instead.

I use npm install balloon-css, but don't know how to import it correctly.

import 'balloon-css' is not work, but import '../node_modules/balloon-css/balloon.css' seems not good.

Here is the commit.

[MrOrz]

#153 fixes this.