html表格边框怎么去掉

.table {

    text-align: center;

  }

  .table table {

    font-size: 14px;

    border-collapse: collapse;

    width: 70%;

    table-layout: fixed;

    text-align: center;

    line-height: 25px;

    margin:0 auto;

  }

    .table table tr {

        border: dashed 1px #a59e9e;

        border-left: none;

        border-right: none;

    }