aside{
    text-align: center;
}

aside div.building_panel{
    display: block;
    font-size: 200%;
    margin: 2em auto 1em auto;
}

main table#levels{
    border-collapse: collapse;
    margin: auto;
}

main table#levels td, th{
    border: 0.1em solid #000000;
}

main table#levels th{
    font-weight: bold;
    padding: 0.5em;
    background-color: #000000aa;
}

main table#levels tr.even td{
    background-color: #00000022;
}

main table#levels tr.odd td{
    background-color: #00000044;
}