Hi
You can use this custom CSS to override the color:
.acm-calendar .calendar-table .col-header h3 {
color: #ff0000 !important;
}
.acm-calendar .calendar-table .col-body .calendar-info .time-class {
color: #ffff00 !important;
}
Unfortunately, there is no place to put the element/class for each team so it's hard to add different color for them now.