Inserire Font Awesome in un after o before

[ninja72]

libreria css di FA

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.0/css/all.min.css">

stile css

 .cnt-thumb a::before {
            content: "\f00e";
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
        }