body {
    margin: auto;
    margin-bottom: 7em;
    max-width: 750px;
    padding: 5px;
}

table, th, td {
    border-collapse: collapse;
}

td {
    border: 1px solid black;
}

td, th {
    padding: 5px;
}

th {
    border: 2px solid black;
    text-align: center;
}