CSS named color
Dark Blue #00008B
Dark Blue is dark vivid blue. Below: every color format, WCAG contrast against black and white, its tints, shades and tones, and the harmonies that pair with it.
Color values
Contrast & accessibility
WCAG contrast ratio of Dark Blue used as a foreground on white and black backgrounds.
Aa The quick brown fox
15.30:1
On white
AA ✓ AAA ✓ AA Large ✓
Aa The quick brown fox
1.37:1
On black
AA ✕ AAA ✕ AA Large ✕
Tints, shades & tones
Systematic variations of Dark Blue — click any swatch to copy its hex.
Tintsmixed toward white
Shadesmixed toward black
Tonesmixed toward gray
Color harmonies
Palettes built from Dark Blue by rotating its hue. Each swatch links to its closest named color.
Complementary
Split-complementary
Use Dark Blue in your stack
Tailwind (arbitrary value)
Works for any property: text-[#00008b], border-[#00008b].
CSS custom property
Reference it anywhere with var(--color).
Build a full theme
Turn Dark Blue into a complete shadcn/ui palette — light & dark, contrast-checked, one-command install.
Extract a theme →