Consolidando Conhecimentos

HTML

<table>
    <thead>
                <tr>
                    <th>Dia</th>
                    <th>Horário</th>
                </tr>
    </thead>
            <tbody>
                    <tr>
                        <td>Segunda</td>
                        <td>8h ~ 19h</td>
                    </tr>

                    <tr>
                        <td>Quarta</td>
                        <td>8h ~ 19h</td>
                    </tr>

                    <tr>
                        <td>Sexta</td>
                        <td>8h ~ 19h</td>
                    </tr>
        </tbody>
</table>

CSS

table {
    margin: 20px 0 40px;
}

thead {

    background: #555555;
    color: white;
    font-weight: bold;
}

td, th {

    border: 1px solid #000000;
    padding: 8px 15px;
}