#main{position:relative}
.v2715-sheet-back{position:absolute;left:12px;top:10px;z-index:31;width:36px;height:36px;border:0;border-radius:50%;background:#f1f4f8;color:#263852;font:800 25px/36px Arial;display:grid;place-items:center;cursor:pointer}
.v274-close-x{top:10px!important;right:12px!important}
.v2715-main-back{position:sticky;float:left;top:4px;z-index:13;width:34px;height:34px;border:1px solid var(--line);border-radius:50%;background:#fff;color:#31435a;font:800 24px/30px Arial;cursor:pointer;margin:0 8px 6px 0}
.v274-main-close{top:4px!important}