More control over designing elements such as font colors

I noticed that I can't change the color of fonts to flow with our brand colors (options are preset colors) nor can we change fonts to any color when in dark mode...leaving the options looking blank until client rolls mouse over areas to reveal that there are options available for them to choose (this is in the questions area asked when booking appointments, using dropdown feature.) It would be nice to have more control so we can match our pages fully to our branding.