span.med_on_time-not-on-time {
    background-color: #f24e4e;
    color: white;
}
span.med_on_time-on-time {
    background-color: #22a282;
    color: white;
}
span.med_on_time-no-data {
    background-color: #ddd;
    color: #666;
}