Table headers position:sticky and border issue

Question

I have a table that I\'m trying to get sticky headers, following this article. Except my table style has the headers with a border at the top and bottom.

The part I

Answer 1

Another working solution (tested at latest Chrome and FF) - wrap th/td content with divs and use those divs borders instead of cell's borders.

<div class="wrapper">
  <table>
  <thead>
    <tr>
      <th>
        <div class="cell">head1</div>
      </th>
      <th>
        <div class="cell">head2</div>
      </th>
      <th>
        <div class="cell">head3</div>
      </th>
      <th>
        <div class="cell">head4</div>
      </th>
      <th>
        <div class="cell">head5</div>
      </th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
    </tr>
    <tr>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
    </tr>
    <tr>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
      <td>
        <div class="cell">1</div>
      </td>
    </tr>
  </tbody>
</table>
</div>

table {
  border-collapse: collapse;
  table-layout: fixed;
  width: 500px;
}

.wrapper {
  height: 150px;
  overflow: auto;
}

td, th {
  width: 150px;
  height: 50px;
  text-align: center;
  font-size: 32px;
  padding: 0;
}

th {
  position: sticky;
  top: 0;
  left: 0;
  background-color: #fff;
}

.cell {
  border: 1px solid black;
  height: 100%;
}

td .cell {
  border-top: none;
  border-left: none;
}

th .cell {
  border-left: none;
}

td:first-child .cell,
th:first-child .cell {
  border-left: 1px solid black;
}

Answer 2

You can add

.table {
  border-collapse: separate;
}

But unfortunately it looks bad, a better solution will be adding a workaround using a pseudo-element.

th:after,
th:before {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
}

th:before {
  top: -1px;
  border-top: 1px solid red;
}

th:after {
  bottom: -1px;
  border-bottom: 2px solid red;
}

.table-sticky-container {
  height: 200px;
  overflow-y: scroll;
  border-top: 1px solid green;
  border-bottom: 1px solid green;
}

.table-sticky th {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 2;
}

th:after,
th:before {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
}

th:before {
  top: -1px;
  border-top: 1px solid red;
}

th:after {
  bottom: -1px;
  border-bottom: 2px solid red;
}

<link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css'>

<div class="table-sticky-container">
    <table class="table table-sticky">
      <thead class="thead-light">
        <tr>
          <th scope="col">Name</th>
          <th scope="col">Title</th>
          <th scope="col">ID</th>
          <th scope="col">Username</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>Malcolm Reynolds</td>
          <td>Captain</td>
          <td>9035749867</td>
          <td>mreynolds</td>
        </tr>
        <tr>
          <td>Zoe Washburne</td>
          <td>First Officer</td>
          <td>8908980980</td>
          <td>zwashburne</td>
        </tr>
        <tr>
          <td>Kaylee Frye</td>
          <td>Engineer</td>
          <td>6678687678</td>
          <td>kfrye</td>
        </tr>
        <tr>
          <td>Malcolm Reynolds</td>
          <td>Captain</td>
          <td>9035749867</td>
          <td>mreynolds</td>
        </tr>
        <tr>
          <td>Zoe Washburne</td>
          <td>First Officer</td>
          <td>8908980980</td>
          <td>zwashburne</td>
        </tr>
        <tr>
          <td>Kaylee Frye</td>
          <td>Engineer</td>
          <td>6678687678</td>
          <td>kfrye</td>
        </tr>
      </tbody>
    </table>
  </div>

The second solution

.table {
  border-collapse: collapse;
}

.table-sticky thead th {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 2;
  box-shadow: inset 0 1px 0 red, inset 0 -2px 0 red;
 }

Answer 3

Don't use border-collapse and draw the lines as follows :

td, th {
    border-bottom: 1px solid grey;
    border-right: 1px solid grey;
}

table {
    border-spacing: 0px;
    border-left: 1px solid grey
}

th {
    background-color:#c5e8ec;
    position: sticky;
    position: -webkit-sticky;
    border-top: 1px solid grey;
    top:0;
}

Answer 4

You can add

.table {
  border-collapse: separate;
  border-spacing: 0;
}

Answer 5

Another solution can be :

table {
box-shadow:  1px 1px 1px 1px black; 
}

...kind of