顶部横向滚动条

      body {
        background-image: linear-gradient(to right top, #ffcc00 50%, #eee 50%);
    background-size: 100% calc(100% - 100vh + 5px);
    background-repeat: no-repeat;
          }
          指滚动类容div
          .box::after {
            content: "";
            position: fixed;
            top: 5px;
            left: 0;
            bottom: 0;
            right: 0;
            background: #fff;
            z-index: -1;
        }