MediaWiki:Common.css

.mw-parser-output table.calendar,
.mw-body-content table.calendar {
    width: 100% !important;
    border-collapse: collapse !important;
    font-family: sans-serif !important;
    font-size: 1.05em !important;
    margin: 1em 0 !important;
}

.mw-parser-output .calendar th,
.mw-parser-output .calendar td {
    border: 1px solid #ccc !important;
    padding: 0.75em !important;
    text-align: center !important;
    vertical-align: top !important;
    min-width: 90px !important;
}

.mw-parser-output .calendar td a {
    display: block !important;
    color: #0366d6 !important;
    text-decoration: none !important;
    font-weight: bold !important;
    padding: 0.3em !important;
}

.mw-parser-output .calendar td a:hover {
    background-color: #f5f5f5 !important;
    border-radius: 4px !important;
}