calendar {
    border-width: 1px;
}
calendar header,
calendar .header {
    background-color: @bg_color;
    color: @fg_color;
    border-bottom-width: 1px;
}

calendar header button,
calendar header button:hover,
calendar header button:active,
calendar header button:focus {
    border: none;
    background: none;
}

calendar .day-number,
calendar calendar {
    padding: 2px;
}

calendar.highlight,
calendar .highlight {
    color: mix(@fg_color, @bg_color, 0.3);
}

calendar .day-name,
calendar .other-month,
calendar:indeterminate {
    color: mix(@fg_color, @bg_color, 0.5);
}