Primary#00A9D3
Main brand colour. Use for headers, navigation, and primary buttons.
Secondary#9400D3
Companion colour. Use for links, highlights, and hover states.
Tertiary#D32A00
Accent colour. Use for highlights, charts, and callouts.
Quaternary#3FD300
Accent colour. Use sparingly for calls to action and warnings.
Neutral#4B6268
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 ConfirmNavigation
Deep sky blueWorkServicesAboutContact
Alerts
Information uses the secondary colour.
Success uses tertiary.
Warnings use quaternary.
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 500Dark surface
Primary 900 works as a footer or hero background. Secondary 300 gives headings lift without glare.
Get startedChart colours
Export as CSS variables
Copy this block into your stylesheet, or link to 00a9d3-tetrad.css and 00a9d3-tetrad.json.
:root {
--primary-50: #E6F6FB;
--primary-100: #B2E5F2;
--primary-300: #66CBE5;
--primary-500: #00A9D3;
--primary-700: #007F9E;
--primary-900: #00546A;
--secondary-50: #F4E6FB;
--secondary-100: #DFB2F2;
--secondary-300: #BF66E5;
--secondary-500: #9400D3;
--secondary-700: #6F009E;
--secondary-900: #4A006A;
--tertiary-50: #FBEAE6;
--tertiary-100: #F2BFB2;
--tertiary-300: #E57F66;
--tertiary-500: #D32A00;
--tertiary-700: #9E2000;
--tertiary-900: #6A1500;
--quaternary-50: #ECFBE6;
--quaternary-100: #C5F2B2;
--quaternary-300: #8CE566;
--quaternary-500: #3FD300;
--quaternary-700: #2F9E00;
--quaternary-900: #206A00;
--neutral-50: #EDEFF0;
--neutral-100: #C9D0D2;
--neutral-300: #93A1A4;
--neutral-500: #4B6268;
--neutral-700: #384A4E;
--neutral-900: #263134;
}
Steps 50 to 300 are tints. Step 500 is the base colour. Steps 700 and 900 are shades.