#21588B Hex Color
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A muted, dark blue with gray undertones. #21588b reads steady and serious, which suits finance dashboards, government sites, and dark UI headers. White text hits about 7.4:1 contrast against it, so small body text passes AA with room to spare. Pair it with burgundy for warmth, or desaturate it toward gray; knowing what colors make gray helps when building muted palettes around it. Best used as a dominant base.
Questions about #21588b
What is #21588b in RGB, HSL and CMYK?
In RGB, #21588b is rgb(33, 88, 139), in HSL hsl(209, 62%, 34%) and in CMYK 76%, 37%, 0%, 45%.
What text color works best on #21588b?
White text. Contrast sits around 7.4:1, well above the 4.5:1 needed for WCAG AA body text, so small type stays readable. Dark text on this shade falls short.
What colors pair well with #21588b?
Burgundy deepens it nicely, while warm sand or muted coral offsets its cool character. Stick to desaturated partners; bright accents fight its low-key mood.
Is #21588b readable on white or black?
#21588b has a 7.41:1 contrast ratio on white and 2.83:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it works for body text and on black it is too faint for text. Try other pairs in the contrast checker.