#scrollTopBtn{position:fixed;bottom:30px;right:30px;width:50px;height:50px;border-radius:50%;background:#fff0;border:none;cursor:pointer;opacity:0;visibility:hidden;transform:scale(.5);transition:opacity 0.3s ease,visibility 0.3s ease,transform 0.3s cubic-bezier(.175,.885,.32,1.275);z-index:9999;display:flex;align-items:center;justify-content:center;filter:drop-shadow(0 2px 4px rgb(194 58 64 / .2))}#scrollTopBtn.show{opacity:1;visibility:visible;transform:scale(1)}#scrollTopBtn .arrow{font-size:22px;font-weight:800;z-index:2;margin-top:-2px}.progress-circle{position:absolute;top:0;left:0;width:100%;height:100%;transform:rotate(-90deg)}.progress-circle circle.track{fill:none;stroke-width:2}.progress-circle circle.progress{fill:none;stroke-width:2;stroke-linecap:round;transition:stroke-dashoffset 0.1s linear}