Change the Colour Scheme in a Theme

The principle colours used in the theme are define at the top of theme/theme.less:

@primary-hue: 217;  // Blue
@secondary-hue: 7;  // Red
@tertiary-hue: 140; // Green
@link-color: hsl(@primary-hue,90%,30%);

Change the @primary-hue, @secondary-hue, and @tertiary-hue variables to the desired hue. (Hue is a value between 0 and 360 and corresponds to a colour wheel.)

For more precise control, the colour of individual elements can be controlled in the styling partial stylesheets found in theme/partials/.