Blue and Yellow

CSS Variables

:root {
  --color-a: #0000FF;
  --color-b: #FFFF00;
  --color-a-rgb: 0, 0, 255;
  --color-b-rgb: 255, 255, 0;
}

JSON

{
  "name": "Blue and Yellow",
  "colors": [
    {
      "name": "Blue",
      "hex": "#0000FF",
      "rgb": [
        0,
        0,
        255
      ]
    },
    {
      "name": "Yellow",
      "hex": "#FFFF00",
      "rgb": [
        255,
        255,
        0
      ]
    }
  ],
  "harmony": "Complementary",
  "contrastRatio": 8
}

Do blue and yellow go together?

Yes. Blue and Yellow form a complementary color combination. These colors sit opposite each other on the wheel, producing maximum visual contrast. Complementary pairings are vibrant and attention-grabbing, but a 70/30 split keeps them from shouting. The pairing has a WCAG contrast ratio of 8.00:1, which passes AA for large text and UI components.

What is the contrast ratio between blue and yellow?

The WCAG 2.1 contrast ratio between Blue (#0000FF) and Yellow (#FFFF00) is 8.00:1. This passes AAA for all text sizes.

How do I use blue and yellow in design?

A safe starting point is the 60/30/10 rule: give one color about 60 percent of the surface area, the other about 30 percent, and reserve the remaining 10 percent for an accent or neutral. Since these are complementary colors, lean toward a 70/25/5 split to keep the contrast from becoming overwhelming. Test the result with our Contrast Checker if text is involved.

What are the hex and RGB values for blue and yellow?

Blue has the hex code #0000FF and RGB values rgb(0, 0, 255). Yellow has the hex code #FFFF00 and RGB values rgb(255, 255, 0). You can copy these directly into CSS or use the design tokens provided on this page.