/* 四边小角*/

.left-top {
    position: absolute;
    width: 10px;
    height: 10px;
    border-top: 2px solid #456DA8;
    border-left: 2px solid #456DA8;
    top: 0;
    left: 0;
  }
  
  .right-top {
    position: absolute;
    width: 10px;
    height: 10px;
    border-top: 2px solid #456DA8;
    border-right: 2px solid #456DA8;
    right: 0;
    top: 0;
  }
  
  .left-bottom {
    position: absolute;
    width: 10px;
    height: 10px;
    border-left: 2px solid #456DA8;
    border-bottom: 2px solid #456DA8;
    bottom: 0;
    left: 0;
  }
  
  .right-bottom {
    position: absolute;
    width: 10px;
    height: 10px;
    border-right: 2px solid #456DA8;
    border-bottom: 2px solid #456DA8;
    bottom: 0;
    right: 0;
  }
  .marginLeft12{
    margin-left:12px;
  }