.nut-backtop{display:none;position:fixed}.nut-backtop.show{width:40px;height:40px;background:var(--nutui-gray-6, #ffffff);color:var(--nutui-gray-1, #595959);border:1px solid var(--nutui-backtop-border-color, #e0e0e0);border-radius:50%;display:flex;align-items:center;justify-content:center}.nut-backtop.show :active{background:rgba(0,0,0,.1)}.nut-backtop-main{transition:all .2s ease-in-out}