table {
    margin-left:auto;
    margin-right:auto;
}
nav table {
    table-layout:fixed;
    width:95%;
    border-spacing:15px;
}
nav td {
    width:30%;
}
nav td:nth-child(1) {
    text-align:left;
}
nav td:nth-child(2) {
    text-align:center;
}
nav td:nth-child(3) {
    text-align:right;
}
main td {
    padding:10px;
}
#chron, #chron td {
    border:1px solid;
    font-weight:bold;
    font-size:large;
}