#ffff00
#ffff00 is rgb(255, 255, 0), or hsl(60, 100%, 50%). The nearest reference Tailwind v4 token is yellow-300 (#ffdf20), not an exact match.
Conversions
WCAG contrast
| Background | Ratio | AA text | AA large | AAA text |
|---|---|---|---|---|
| white | 1.07:1 | fail | fail | fail |
| black | 19.56:1 | pass | pass | pass |
| slate-900 | 16.62:1 | pass | pass | pass |
| gray-100 | 1.02:1 | 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 #ffff00 in real UI palettes
These colors appear alongside #ffff00 in StyleKit's curated palettes. Co-occurrence is not a promise of text readability; each pair includes its measured contrast.
- #00ffff
Used together in Anti-Design, Arcade CRT and 3 more styles.
1.17:1
Not for normal text - #ff00ff
Used together in Anti-Design, Arcade CRT and 3 more styles.
2.92:1
Not for normal text - #000000
Used together in Anti-Design, Geometric Bold and 1 more styles.
19.56:1
AA normal text - #ffffff
Used together in Anti-Design, Geometric Bold and 1 more styles.
1.07:1
Not for normal text - #0000ff
Used together in Anti-Design, Geometric Bold.
8.00:1
AA normal text - #00ff00
Used together in Anti-Design, Cyberpunk Neon.
1.28:1
Not for normal text
A readable starting point
black text on #ffff00: 19.56:1 contrast.
Design styles using this color
Tints and shades
Lightness ladder in HSL space, from the lightest tint to the darkest shade of #ffff00.
Similar colors in the library
Nearest swatches by perceptual OKLab distance across all curated style palettes.
AI prompt snippet
Use #ffff00 as the accent color, following the Anti-Design style: rgb(255, 255, 0), nearest Tailwind token yellow-300. Keep text contrast at least 4.5:1 (this color scores 1.07:1 on white, 19.56:1 on black).
Paste this into ChatGPT, Claude, Cursor, or v0 to use #ffff00 with correct contrast constraints. Browse all palette colors.
Questions about #ffff00
What color is #ffff00?
#ffff00 is rgb(255, 255, 0), or hsl(60, 100%, 50%). The nearest reference Tailwind v4 token is yellow-300 (#ffdf20), not an exact match.
What text color should I use on #ffff00?
Black (#000000) has the higher black-or-white contrast against #ffff00: 19.56:1. 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 #ffff00 in Tailwind CSS?
Use bg-[#ffff00], text-[#ffff00], 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.