提示框阴影三角

效果：

image.png

代码：

<div class="content-wrapper">
  hover me
  <div class="hover-detail">
    <span>商品1</span>
    <span>商品2</span>
    <span>商品3</span>
  </div>
</div>

.content-wrapper {
    position: relative;
    height: 32px;
    cursor: pointer;
    /*float: left;
    white-space: nowrap;内容要显示在一行，且浮动时，要加*/
  }
  .hover-detail {
    position: absolute;
    top: 30px;
    left: 0;
    /*width: 116px;*/
    /*height: 72px;*/
    background-color: #ffffff;
    box-shadow: 1px 2px 7px 0px rgba(0, 0, 0, 0.2);
    border: solid 1px #ececec;
    line-height: 18px;
    font-size: 12px;
    color: #333333;
    padding: 10px;
    text-align: left;
    cursor: auto;
    opacity: 0;
    transform: scale(0);
    transition: all 0.4s;
  }
  .hover-detail::before {
    content: '';
    position: absolute;
    top: -5px;
    left: 53px;
    width: 10px;
    height: 10px;
    background: #fff;
    transform: rotate(-45deg);
    box-shadow: 2px -1px 8px 0px rgba(0, 0, 0, 0.17);
  }
  .hover-detail::after {
    content: '';
    position: absolute;
    top: 0px;
    left: 40px;
    width: 35px;
    height: 9px;
    background: #fff;
  }
  .content-wrapper:hover .hover-detail {
    z-index: 10;
    opacity: 1;
    transform: scale(1);
  }