一定要在最外层；

  //未选中框
  /deep/ .el-checkbox__inner{
    border-color: #0862a3;
  }
  //选中框
  /deep/ .el-checkbox__input.is-checked .el-checkbox__inner{
    background-color: #0862a3;
    border-color: #0862a3;
  }
  //未选中框时右侧文字
  /deep/ .el-checkbox__label{

  }
  //选中框时右侧文字
  /deep/ .el-checkbox__input.is-checked+.el-checkbox__label{
    color: #0862a3;
  }