.fcc-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:56px;height:56px;border-radius:999px;color:#fff;
  text-decoration:none;box-shadow:0 8px 20px rgba(0,0,0,.18);
  position:fixed;z-index:9999;transition:transform .15s ease, box-shadow .15s ease;
}
.fcc-btn img{ width:45px; height:45px; border-radius:50%; object-fit:cover; display:block; }
.fcc-btn:hover{ transform:translateY(-2px); box-shadow:0 10px 24px rgba(0,0,0,.22); }