How to use all th width for the inside absolute div

Question

In this fiddle, you can see that the header is fixed. My problem is that i can't manage to have the absolute <div> inside <th> to have 100% width of the <th>

Setting width: 100% to the <div> make it use all the width available

Setting position: relative to the <th> put the <div> somewhere i can't see it (looks like it's under the <th>, and even use of z-index change nothing.

NB : without JS, only HTML/CSS

html, body{
  margin:0;
  padding:0;
  height:100%;
}

section {
  position: relative;
  border: 1px solid #000;
  padding-top: 37px;
  background: #500;
}

.container {
  overflow-y: auto;
  height: 200px;
}

table {
  border-spacing: 0;
  width:100%;
}

td + td {
  border-left:1px solid #eee;
}

td, th {
  border-bottom:1px solid #eee;
  background: #ddd;
  color: #000;
  padding: 10px 25px;
}

th {
  height: 0;
  line-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  color: transparent;
  border: none;
  white-space: nowrap;
}

th > div{
  position: absolute;
  background: transparent;
  color: #fff;
  padding: 9px 25px;
  top: 0;
  margin-left: -25px;
  line-height: normal;
  border-left: 1px solid #800;
}

th:first-child div{
  border: none;
}

<section class="">
  <div class="container">
    <table>
      <thead>
        <tr>
          <th>
            Table attribute name
            <div>Table attribute name</div>
          </th>
          <th>
            Value
            <div>Value</div>
          </th>
           <th>Test<div>
           Test
           </div></th>
          <th>
            Description
            <div>Description</div>
          </th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>align</td>
          <td>left, center, right</td>
          <td></td>
          <td>Not supported in HTML5. Deprecated in HTML 4.01. Specifies the alignment of a table according to surrounding text</td>
        </tr>
        ...
      </tbody>
    </table>
  </div>
</section>

i already try this but the problem here is that the colonne width are all the same, and sometime alignment break due to some content

Answer 1

You don't need to add div and position:absolute and color transparent also. You can make header sticky with full width using position: sticky on thead th style. Read more about position-sticky.

See the Snippet below:

html, body{
  margin:0;
  padding:0;
  height:100%;
}
section {
  position: relative;
  border: 1px solid #000;
  padding-top: 37px;
  background: #500;
}
.container {
  overflow-y: auto;
  height: 200px;
}
table {
  border-spacing: 0;
  width:100%;
}
td + td {
  border-left:1px solid #eee;
}
td, th {
  border-bottom:1px solid #eee;
  background: #ddd;
  color: #000;
  padding: 10px 25px;
}
th {
  height: 0;
  line-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  color: transparent;
  border: none;
  white-space: nowrap;
}
th > div{
  position: absolute;
  background: transparent;
  color: #fff;
  padding: 9px 25px;
  top: 0;
  margin-left: -25px;
  line-height: normal;
  border-left: 1px solid #800;
}
th:first-child div{
  border: none;
}

<section class="">
  <div class="container">
    <table>
      <thead>
        <tr>
          <th>
            Table attribute name
            <div>Table attribute name</div>
          </th>
          <th>
            Value
            <div>Value</div>
          </th>
           <th>Test<div>
           Test
           </div></th>
          <th>
            Description
            <div>Description</div>
          </th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>align</td>
          <td>left, center, right</td>
          <td></td>
          <td>Not supported in HTML5. Deprecated in HTML 4.01. Specifies the alignment of a table according to surrounding text</td>
        </tr>
        <tr>
          <td>bgcolor</td>
          <td>rgb(x,x,x), #xxxxxx, colorname</td>
          <td>Not supported in HTML5. Deprecated in HTML 4.01. Specifies the background color for a table</td>
        </tr>
        <tr>
          <td>border</td>
          <td>1,""</td>
          <td>Specifies whether the table cells should have borders or not</td>
        </tr>
        <tr>
          <td>cellpadding</td>
          <td>pixels</td>
          <td>Not supported in HTML5. Specifies the space between the cell wall and the cell content</td>
        </tr>
        <tr>
          <td>cellspacing</td>
          <td>pixels</td>
          <td>Not supported in HTML5. Specifies the space between cells</td>
        </tr>
        <tr>
          <td>frame</td>
          <td>void, above, below, hsides, lhs, rhs, vsides, box, border</td>
          <td>Not supported in HTML5. Specifies which parts of the outside borders that should be visible</td>
        </tr>
        <tr>
          <td>rules</td>
          <td>none, groups, rows, cols, all</td>
          <td>Not supported in HTML5. Specifies which parts of the inside borders that should be visible</td>
        </tr>
        <tr>
          <td>summary</td>
          <td>text</td>
          <td>Not supported in HTML5. Specifies a summary of the content of a table</td>
        </tr>
        <tr>
          <td>width</td>
          <td>pixels, %</td>
          <td>Not supported in HTML5. Specifies the width of a table</td>
        </tr>
      </tbody>
    </table>
  </div>
</section>

You can test it here also..