PARTE HTML
<table>
<thead>
<tr>
<th>Día</th>
<th>Horartio</th>
</tr>
</thead>
<tbody>
<tr>
<td>Lunes</td>
<td>08h - 20h</td>
</tr>
<tr>
<td>Miercoles</td>
<td>08h - 20h</td>
</tr>
<tr>
<td>Viernes</td>
<td>08h - 20h</td>
</tr>
</tbody>
</table>
PARTE CSS
table {
margin: 40px 40px;
}
thead {
background: #555555;
color: white;
font-weight: bold;
}
td, th {
border: 1px solid #000000;
padding: 8px 15px;
}