<table>
  <tr>
    <th>a1</th>
    <th>a2</th>
    <th>a3</th>
    <th>a4</th>
    <th>a5</th>
  </tr>
  <tr>
    <td>b1</td>
    <td>b2</td>
    <td>b3</td>
    <td>b4</td>
    <td>b5</td>
  </tr>
</table>


<style>
table {
  font-family: Arial, Helvetica, sans-serif;
  border-collapse: collapse;
  width: 100%;
}

td,
th {
  border: 1px solid #ddd;
  padding: 8px;
}

tr:nth-child(even) {
  background-color: #333;
  color: #ddd;
}
tr:nth-child(odd) {
  background-color: #222;
  color: #ddd;
}

tr:hover {
  background-color: #444;
}

th {
  padding-top: 12px;
  padding-bottom: 12px;
  text-align: left;
  background-color: #1e1e1e;
  color: white;
}
</style>