tcl_update_db/assets/style.css

body {
    font-family: sans-serif;
}

table td+td {
    border-left: 1px dashed silver;
    text-align: center;
}

td {
    font-family: monospace;
}

td.ref {
    font-weight: bold;
}

td.empty {
    color: silver;
}

tr:hover {
    background-color: #ddd;
}