<template>
  <div>
    <div class="content">
      盒子
      <div class="topUserInfo">
        弹窗
      </div>
    </div>
  </div>
</template>

<script>
export default {

}
</script>

<style lang="less" scoped>
.content {
  margin-top: 300px;
  position: relative;
  margin-left: 100px;
  border: 1px solid red;
  width: 100px;
  &:hover {
    .topUserInfo {
      display: block;
    }
  }
}
.topUserInfo {
  display: none;
  width: 220px;
  height: 40px;
  position: absolute;
  top: -50px;
  left: 50%;
  transform: translate(-50%, 0);
  background: #fff;
  border: 1px solid #1890ff;
  border-radius: 4px;
  z-index: 101;
  &::before {
    position: absolute;
    bottom: -5px;
    left: calc(50% - 10px);
    overflow: hidden;
    width: 8px;
    height: 8px;
    background: #fff;
    border-left: 1px solid #1890ff;
    border-top: 1px solid #1890ff;
    -webkit-transform: rotate(225deg);
    -moz-transform: rotate(225deg);
    -o-transform: rotate(225deg);
    transform: rotate(225deg);
    content: '';
  }
}
</style>