:host,:root{--van-back-top-size:40px;--van-back-top-right:30px;--van-back-top-bottom:40px;--van-back-top-z-index:100;--van-back-top-icon-size:20px;--van-back-top-text-color:#fff;--van-back-top-background:var(--van-blue)}.van-back-top{align-items:center;background-color:var(--van-back-top-background);border-radius:var(--van-radius-max);bottom:var(--van-back-top-bottom);box-shadow:0 2px 8px #0000001f;color:var(--van-back-top-text-color);cursor:pointer;display:flex;height:var(--van-back-top-size);justify-content:center;position:fixed;right:var(--van-back-top-right);transform:scale(0);transition:var(--van-duration-base) cubic-bezier(.25,.8,.5,1);width:var(--van-back-top-size);z-index:var(--van-back-top-z-index)}.van-back-top:active{opacity:var(--van-active-opacity)}.van-back-top__placeholder{display:none}.van-back-top--active{transform:scale(1)}.van-back-top__icon{font-size:var(--van-back-top-icon-size);font-weight:var(--van-font-bold)}