#ffb900
#ffb900 is rgb(255, 185, 0), or hsl(44, 100%, 50%). It exactly matches the sRGB hex approximation of amber-400 in the reference Tailwind v4 palette.
Conversions
WCAG contrast
| Background | Ratio | AA text | AA large | AAA text |
|---|---|---|---|---|
| white | 1.72:1 | fail | fail | fail |
| black | 12.19:1 | pass | pass | pass |
| slate-900 | 10.36:1 | pass | pass | pass |
| gray-100 | 1.57:1 | fail | fail | fail |
Ratios use WCAG relative luminance for opaque sRGB colors. Normal text requires 4.5:1, or 7:1 at AAA. Large text requires 3:1: at least 24 CSS pixels, or about 18.67 CSS pixels when bold. Pass/fail uses the unrounded ratio. Contrast alone is not a full accessibility assessment.
Colors paired with #ffb900 in real UI palettes
These colors appear alongside #ffb900 in StyleKit's curated palettes. Co-occurrence is not a promise of text readability; each pair includes its measured contrast.
- #0078d4
Used together in Fluent Design.
2.63:1
Not for normal text - #00cc6a
Used together in Fluent Design.
1.24:1
Not for normal text - #106ebe
Used together in Fluent Design.
3.05:1
Not for normal text - #e81123
Used together in Fluent Design.
2.69:1
Not for normal text
A readable starting point
black text on #ffb900: 12.19:1 contrast.
Design styles using this color
Tints and shades
Lightness ladder in HSL space, from the lightest tint to the darkest shade of #ffb900.
Similar colors in the library
Nearest swatches by perceptual OKLab distance across all curated style palettes.
AI prompt snippet
Use #ffb900 as the accent color, following the Fluent Design style: rgb(255, 185, 0), nearest Tailwind token amber-400. Keep text contrast at least 4.5:1 (this color scores 1.72:1 on white, 12.19:1 on black).
Paste this into ChatGPT, Claude, Cursor, or v0 to use #ffb900 with correct contrast constraints. Browse all palette colors.
Questions about #ffb900
What color is #ffb900?
#ffb900 is rgb(255, 185, 0), or hsl(44, 100%, 50%). It exactly matches the sRGB hex approximation of amber-400 in the reference Tailwind v4 palette.
What text color should I use on #ffb900?
Black (#000000) has the higher black-or-white contrast against #ffb900: 12.19:1. This calculation assumes opaque, flat sRGB colors. Normal text requires 4.5:1 and large text 3:1 under WCAG 2.2 SC 1.4.3; it is not a complete accessibility assessment.
How can I use exactly #ffb900 in Tailwind CSS?
Use bg-[#ffb900], text-[#ffb900], or a CSS custom property instead of substituting a nearby named token. The reference palette is Tailwind CSS 4.1.18, converted from OKLCH to sRGB hex; newer Tailwind versions and custom themes can differ.
Sources and calculation limits
Reference palette: Tailwind CSS 4.1.18, converted from OKLCH to sRGB hex. Named tokens are versioned approximations; use the exact hex utilities when matching an existing design. Palette pairings come from the linked StyleKit definitions, not external popularity or preference data.