factor/extra/webapps/wiki/wiki.css

.comparison th {
    border-width: 1px;
    border-color: #666;
    border-style: solid;
}

.comparison table {
    border-color: #666;
    border-style: solid;
    border-width: 1px;
    border-spacing: 0;
    border-collapse: collapse;
}

.insert {
    background-color: #9f9;
}

.delete {
    background-color: #f99;
}

.revisions table, .revisions td, .revisions th {
    border-color: #666;
    border-style: solid;
}

.revisions table {
    border-width: 0 0 1px 1px;
    border-spacing: 0;
    border-collapse: collapse;
}

.revisions td, .revisions th {
    margin: 0;
    padding: 4px;
    border-width: 1px 1px 0 0;
}