.rsntf-back-btn{ position:fixed; left:16px; bottom:16px; z-index:999999; width:48px; height:48px; border-radius:999px; border:none; display:inline-flex; align-items:center; justify-content:center; box-shadow:0 6px 18px rgba(0,0,0,.25); cursor:pointer; background:var(--tf-green,#006600); color:var(--tf-white,#fff); }
.rsntf-back-btn svg{ fill:currentColor; }