@Sales Info
It works how it works. I suggest that you design your form with fewer tabs. Keep in mind that you still can use Section within your tabs.
The color is only the underline ands not the whole tab.
Here are 20 colors which look very different beside each other. I just use them in sequence for my tabs.
Red e6194b
Green 3cb44b
Yellow ffe119
Blue 0082c8
Orange f58231
Purple 911eb4
Cyan 46f0f0
Magenta f032e6
Lime d2f53c
Pink fabebe
Teal 008080
Lavender e6beff
Brown aa6e28
Beige fffac8
Maroon 800000
Mint aaffc3
Olive 808000
Coral ffd8b1
Navy 000080
Grey 808080
White FFFFFF
Black 000000