Blue and Red

CSS Variables

:root {
  --color-a: #0000FF;
  --color-b: #FF0000;
  --color-a-rgb: 0, 0, 255;
  --color-b-rgb: 255, 0, 0;
}

JSON

{
  "name": "Blue and Red",
  "colors": [
    {
      "name": "Blue",
      "hex": "#0000FF",
      "rgb": [
        0,
        0,
        255
      ]
    },
    {
      "name": "Red",
      "hex": "#FF0000",
      "rgb": [
        255,
        0,
        0
      ]
    }
  ],
  "harmony": "Triadic",
  "contrastRatio": 2.15
}

Do blue and red go together?

Yes. Blue and Red form a triadic color combination. These colors are roughly 120 degrees apart on the wheel — a triadic relationship that stays lively without clashing. Triadic schemes work best when one color dominates and the other two act as accents. The pairing has a WCAG contrast ratio of 2.15:1, which is below the AA threshold for text — use it for decorative purposes rather than text readability.

What is the contrast ratio between blue and red?

The WCAG 2.1 contrast ratio between Blue (#0000FF) and Red (#FF0000) is 2.15:1. This ratio is below AA. Use the pairing for backgrounds, borders, and decorative elements rather than text-on-background combinations.

How do I use blue and red 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. If one color is significantly darker, use it for text or structural elements and the lighter one for backgrounds. Test the result with our Contrast Checker if text is involved.

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

Blue has the hex code #0000FF and RGB values rgb(0, 0, 255). Red has the hex code #FF0000 and RGB values rgb(255, 0, 0). You can copy these directly into CSS or use the design tokens provided on this page.