Haz lo que hicimos en clase

HTML:

        <table>
            <thead>
                <tr>
                    <th>Día</th>
                    <th>Horario</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>

CSS:

table{
    margin: 40px;
}
thead{
    background-color: #555555;
    color: white;
    font-weight: bold;
}
td, th{
    border: 1px solid black;
    padding: 8px 15px;
}