body {
    text-align: center;
}
main {
    display: flex;
    flex-flow: wrap;
}
main > table {
    margin: auto;
}
.member {
    border-collapse: collapse;
    border: 4px solid #335;
}
.vlans {
    border-collapse: collapse;
}
.member td,
.vlans td {
    border: 2px inset;
}
.number {
    text-align: center;
    min-width: 2em;
    height: 2em;
    mix-blend-mode: darken;
}
.pvid {
    background-color: hsl(var(--pvid) 100% 58%);
}
.shutdown {
    background-color: lightgray;
    color: gray;
}