.air_bubble {
    float:left;
    position: absolute;
    background-color: #fff;
    border-bottom-color: #fff;
    /*为了给after伪元素自动继承*/
    color: #333333;
    font-size: 16px;
    padding: 2px 10px;
    border-radius: 6px;
    box-sizing: border-box;
    word-break: break-all;
    box-shadow: 0px 2px 2px 2px #eee;
  }
  /*此处css为向上带阴影的三角，用于气泡箭头*/
  .air_bubble::before {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    top: -6px;
    left: 50%;
    border-style: solid;
    border-width: 6px;
    border-color: transparent transparent #fff #fff;
    transform: rotate(135deg);
    -webkit-box-shadow: -2px 2px 3px 0 #eee;
    -moz-box-shadow: -2px 2px 3px 0 #eee;
    box-shadow: -2px 2px 3px 0 #eee;
  }
   
   
  .side_float_btn {
    /* min-width: 60px; */
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
  }
   
  .side_float_btn:hover {
    /* background: #0084ff; */
  }