wagtail/client/scss/elements/_root.scss

:root {
  @include define-color('color-primary', #007d7e);
  @include define-color(
    'color-primary-darker',
    css-darken(css-adjust-hue(get-color('color-primary'), 1), 4%)
  );
  @include define-color(
    'color-primary-dark',
    css-darken(css-adjust-hue(get-color('color-primary'), 1), 7%)
  );
  @include define-color(
    'color-primary-lighter',
    css-lighten(
      css-desaturate(css-adjust-hue(get-color('color-primary'), 1), 46%),
      48%
    )
  );
  @include define-color(
    'color-primary-light',
    css-lighten(
      css-desaturate(css-adjust-hue(get-color('color-primary'), 1), 44%),
      58%
    )
  );

  @include define-color(
    'color-input-focus',
    css-lighten(css-desaturate(get-color('color-primary'), 40%), 72%)
  );
  @include define-color(
    'color-input-focus-border',
    css-lighten(css-saturate(get-color('color-primary'), 12%), 10%)
  );
}