Font Awesome : How to use Regular style icon ?

[Kambro]

Good evening,

I should like to insert a Font Awesome icon in Regular Style (far) and not in Solid Style (fas).

I don’t know how to change it : by default the Solid Style appears on Elementor site.

Here is my code :

.ma-classe a::before {
    content: "\f15c";
    font-family: "Font Awesome 5 Free";
    padding-right: 15px;
    font-size: 15px;
}

Thank you in advance.