@keyframes pulseElegant{0%{transform:translateX(-50%) scale(1)}50%{transform:translateX(-50%) scale(1.08)}100%{transform:translateX(-50%) scale(1)}}#btnTop{position:fixed;bottom:80px;left:50%;transform:translateX(-50%);display:none;opacity:0;transition:opacity .4s ease-in-out;width:50px;height:50px;line-height:50px;background-color:#007bff;color:#fff;border-radius:50%;font-size:22px;text-align:center;cursor:pointer;box-shadow:0 4px 6px rgba(0,0,0,.2);z-index:9991}#btnTop.visible{display:block;opacity:1;animation:pulseElegant 2s ease-in-out infinite}#btnTop:hover{background-color:#0056b3}@media(max-width:767px){#btnTop{bottom:80px}}