这两个同时写，圆角不会生效

  li {
    width: 282px;
    height: 96px;
    margin-right: 20px;
    box-sizing: border-box;
    border: 1px solid transparent;
    background-image: linear-gradient(#fff, #fff),
        linear-gradient(to right, #8efd9f, #07cbfb);
    background-origin: border-box;
    background-clip: content-box, border-box;
    border-radius: 10px;
  }

这样就实现想要的效果了