To change a color, just click on the color and change the RGB hex numbers. In #AABBCC the AA is the Red value, the BB is the Green value and the CC is the blue value.
I think the number I used was #00FFF3. Just try different combinations until you find one you like. And changing by just one second-position number does make a noticeable difference, i.e., if the number is 8C, changing it to 9C.