如何解决固定表头边框对齐问题

Question

我想创建一个具有固定标题的边框表，但边框未对齐。知道如何解决这个问题吗？

body{
  background-color: #bdc3c7;
}
.table-fixed{
  width: 100%;
  background-color: #f3f3f3;
  tbody{
    height:200px;
    overflow-y:auto;
    width: 100%;
    }
  thead,tbody,tr,td,th{
    display:block;
  }
  tbody{
    td{
      float:left;
    }
  }
  thead {
    tr{
      th{
        float:left;
       background-color: #f39c12;
       border-color:#e67e22;
      }
    }
  }
}

<div class="container">
  <table class="table table-bordered table-fixed">
    <thead>
      <tr>
        <th class="col-xs-3">First Name</th>
        <th class="col-xs-3">Last Name</th>
        <th class="col-xs-6">E-mail</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>

      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">[email protected]</td>
      </tr>
    </tbody>
  </table>
</div>

Answer 1

给CSS，CSS提供CSS样式。

例如，

td, th {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}

Answer 2

你的问题是由你的overflow-y标签中的tbody引起的。为什么不尝试设置它overflow-y:visible而不是overflow-y:auto