div, span{
    text-align: center;
}
table, th, td {
    margin: 5px;
    padding: 5px;

    margin-left: auto;
    margin-right: auto;

    border: 1px solid black;
    border-collapse: collapse;
}
#footer {
    position: fixed;
    bottom: 10px;
    left: auto;
    right: auto;
}