Skip to the color picker

blue-400

#51a2ff

Tailwind CSS v4.3.3 blue-400 is oklch(70.7% 0.165 254.624) in OKLCH, the format Tailwind uses, and #51a2ff in HEX.

Class
OKLCH
HEX
RGB
HSL
CSS
Open #51a2ff in the pickerCheck contrast

Classes

Click to copy. Add /50 for 50% opacity, for example bg-blue-400/50.

Text on blue-400

  • Aawhite2.64:1Hard to read
  • Aablack7.96:1Readable · AA
  • Aablue-9505.58:1Readable · AA

Most readable text from the blue scale: blue-950

Tailwind blue scale

  1. 50
  2. 100
  3. 200
  4. 300
  5. 400
  6. 500
  7. 600
  8. 700
  9. 800
  10. 900
  11. 950

Step 400 in other Tailwind colors

Questions and answers

What is the hex code of Tailwind blue-400?

blue-400 is #51a2ff in HEX, rgb(81 162 255) in RGB and oklch(70.7% 0.165 254.624) in OKLCH. Tailwind CSS v4.3.3 defines its colors in OKLCH, so the HEX value is the closest sRGB match.

Is Tailwind blue-400 accessible for text?

White text on blue-400 has a contrast ratio of 2.64:1 and black text 7.96:1. WCAG AA needs 4.5:1 for normal text and 3:1 for large text, so black text is the better choice here.

How do I use blue-400 in Tailwind CSS?

Add bg-blue-400, text-blue-400 or border-blue-400 to an element. In your own CSS use var(--color-blue-400), the CSS variable Tailwind v4 creates for every color.