.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,#060);color:var(--tf-white,#fff)}.rsntf-back-btn svg{fill:currentColor}.rsntf-back-btn:active{transform:translateY(1px)}