:root,:host{--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{position:fixed;display:flex;align-items:center;justify-content:center;width:var(--van-back-top-size);height:var(--van-back-top-size);right:var(--van-back-top-right);bottom:var(--van-back-top-bottom);z-index:var(--van-back-top-z-index);cursor:pointer;color:var(--van-back-top-text-color);border-radius:var(--van-radius-max);box-shadow:0 2px 8px rgba(0,0,0,.12);transform:scale(0);transition:var(--van-duration-base) cubic-bezier(.25,.8,.5,1);background-color:var(--van-back-top-background)}.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)}
