The colours and font settings that your Adaptable Blotter uses are set using a Theme which acts as a 'skin'.
Adaptable Blotter ships with 2 themes - "Light Theme" and "Dark Theme", but works with any Bootstrap compliant theme.
If you don't like either of the pre-installed Themes you can choose to use your own custom theme instead. Any Bootstrap theme will be suitable. You specify your themes using config (see Predefined Configuration for more information).