div水平垂直居中

    <div class="m-box">
      <div class="m-temp">
        <div class="m-item">fsdafsfasdf</div>
        <div class="m-item">fsdafsfasdf</div>
        <div class="m-item">fsdafsfasdf</div>
      </div>
    </div>

  .m-box{
    background-color: #66fff7;
    height: 300px;
    width: 100%;
    display: flex;
    align-items: center;
  }
  .m-temp{
    background-color: cornflowerblue;
    margin-left: auto;
    margin-right: auto;
  }
  .m-item{
    margin: 10px;
    padding: 10px;
    background-color: white;
    float: left;
  }

.m-temp{
  background-color: cornflowerblue;
  margin-left: auto;
  margin-right: auto;
  /*margin-top: auto;*/
  margin-bottom: auto;
}

  .m-temp{
    background-color: cornflowerblue;
    /*margin-left: auto;*/
    /*margin-right: auto;*/
    margin-top: auto;
    margin-bottom: auto;
  }