Why can't he see fontawesome icons?

Question

css

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.1/css/all.css" integrity="sha384-50oBUHEmvpQ+1lW4y57PTFmhCaXp0ML5d60M1M7uH2+nqUivzIebhndOJK28anvf" crossorigin="anonymous">

The link sees, does not cover anything.
I use a free icon as an example: But it displays as a white square
<i class="fas fa-user-astronaut"></i>

Answer 1

Yuri , try to remove https:and leave only slashes.
//use.fontawesome.com/releases/v5.8.1/css/all.css

Answer 2

Something is overwriting the font rule. Perhaps there is a construct like font-family: Arial !important.
Option for debugging: write font-family directly in the icon tag, give !importantand check. If that doesn't work, well...