@font-face {
  font-family: "Font Awesome 5 Free";
  font-style: normal;
  font-weight: 900;
  font-display: swap; /* ⭐ important */
  src: url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/webfonts/fa-solid-900.woff2")
       format("woff2"),
       url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/webfonts/fa-solid-900.woff")
       format("woff");
}

/* If Brands font also shows warnings, include this too */
@font-face {
  font-family: "Font Awesome 5 Brands";
  font-style: normal;
  font-weight: 400;
  font-display: swap; /* ⭐ */
  src: url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/webfonts/fa-brands-400.woff2")
       format("woff2"),
       url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/webfonts/fa-brands-400.woff")
       format("woff");
}