#content {
    margin: 0 auto;
    padding: 1em;
    width: 50%;
    border: 1px solid black;
}

#centrador {
    margin: 0 auto;
    padding: 1em;
}

table {
    width: 100%;
}

table, table td, table th {
    border: 1px solid black;
    border-collapse: collapse;
}

thead {
    background-color: grey;
    color: white;
    font-weight: bolder;
}

table td {
    text-align: center;
}

h1 {
    text-align: center;
}