XenForo Problem with FontAwesome icon

[Hareon]

I am trying to fix a banner template. Before, that icon fa-user was shown. But after upgrade to 2.3, a square is showing to the users.

The code is:
.userBanner strong {
min-width: 100px;
display: inline-block;
margin-left: 20px;
}
[class*="banner_"], .userBanner {
position: relative;
display: inline-block !important;
margin: 4px 0 5px !important;
font-size: 11px !important;
...

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