table {
    font-size: 1em;
}
#theme .table tr td:nth-child(1) {
    width:20%;
}
#talks .table tr td:nth-child(1) {
    width: 30%;
}

#theme .header {
    font-weight: bold;
    border-top: hidden;
    border-bottom: 0.2em solid lightgray;
    border-left: 0.3em solid lightgrey;
}