Color section height

I would like to reduce the height of a color section to 75px. I removed the padding and assigned an id and entered the following into the quick css
#colorsignup {
font-size: 17px;
height: 75px !important;
}
The color section does not reduce in size smaller than 100px. If I add to the height to test the ID and css it will increase the size.

Thank you for any help