Why Do My Sticky Table Headers Lose Their Borders, and How Can I Fix It?

Border styles disappear on sticky table headers

When attempting to style the borders of a table header with the position: sticky attribute, you may encounter an issue where the borders vanish. This issue stems from the use of border-collapse: collapse.

In CSS, the border-collapse property determines how adjacent table borders should interact. When border-collapse is set to collapse, borders between cells are removed, creating the appearance that a single border surrounds all adjacent elements.

In this case, the use of border-collapse: collapse can interfere with the desired effect of position: sticky. When borders collapse, the top and bottom borders on the

tags bleed into the surrounding elements, including the table () itself and the following row ().

To resolve this issue, you can use border-collapse: separate in conjunction with carefully crafted border styles to achieve the desired effect. Here are some revised CSS rules that will keep the borders intact and fixed in place:

/* Reset border collapse to separate */
border-collapse: separate;

/* Apply both top and bottom borders to the <th> */
table th {
  border-top: 2px solid;
  border-bottom: 2px solid;
  border-right: 2px solid;
}

/* For cells, apply the border to one side only */
table td {
  border-bottom: 2px solid;
  border-right: 2px solid;
}

/* Apply a left border on the first </th><td> or </td><th> in a row */
table th:first-child,
table td:first-child {
  border-left: 2px solid;
}<p>With these modifications, the borders will attach properly to the table header (</p>
</th><th>) elements, remain fixed while scrolling, and retain a collapsed appearance.</th>

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