colourdesign.co.uk
Complementary palette

Light sea green

A complementary colour scheme built on #20B2AA. Two hues opposite on the wheel. Maximum contrast. A tinted neutral keeps text and surfaces consistent.

Primary#20B2AA

Main brand colour. Use for headers, navigation, and primary buttons.

Secondary#B22028

Companion colour. Use for links, highlights, and hover states.

Neutral#4B6866

Tinted neutral drawn from the seed hue. Use for body text, borders, and backgrounds.

Click a swatch to copy its hex code. Badges show WCAG contrast against white text and against dark text (#0F2A3F). AAA is 7:1 or higher. AA is 4.5:1 or higher. AA large is 3:1 or higher.

In use

Sample components show how the colours work together.

Buttons

Primary action Secondary Outline Call to action Confirm

Navigation

Light sea greenWorkServicesAboutContact

Alerts

Information uses the secondary colour.
Success uses secondary.
Warnings use primary.

Typography

Heading in primary

Body copy in neutral 500 on a white card. This keeps long text easy to read.

Muted caption text in neutral 300.

Links use primary 500

Dark surface

Primary 900 works as a footer or hero background. Secondary 300 gives headings lift without glare.

Get started

Chart colours

Export as CSS variables

Copy this block into your stylesheet, or link to 20b2aa-complement.css and 20b2aa-complement.json.

:root {
  --primary-50: #E9F7F6;
  --primary-100: #BCE8E6;
  --primary-300: #79D1CC;
  --primary-500: #20B2AA;
  --primary-700: #188680;
  --primary-900: #105955;
  --secondary-50: #F7E9EA;
  --secondary-100: #E8BCBE;
  --secondary-300: #D1797E;
  --secondary-500: #B22028;
  --secondary-700: #86181E;
  --secondary-900: #591014;
  --neutral-50: #EDF0F0;
  --neutral-100: #C9D2D1;
  --neutral-300: #93A4A3;
  --neutral-500: #4B6866;
  --neutral-700: #384E4C;
  --neutral-900: #263433;
}

Steps 50 to 300 are tints. Step 500 is the base colour. Steps 700 and 900 are shades.