change .ipsTabs_activeItem text color

[Reality Capture Experts]

what css can i use to change text color of  of the active tab text see image   (.ipsTabs_activeItem)  to white. #ffffff  so that the test in green tab is white

/*  tab colors   */
.ipsTabs_activeItem {
  background: #99cc33;
}

.ipsTabs_activeItem {
  text-transform: uppercase;
}

when i add color: #ffffff; to eather of the above it doest work