#0a2540
#0a2540 is rgb(10, 37, 64), or hsl(210, 73%, 15%). The nearest reference Tailwind v4 token is slate-800 (#1d293d), not an exact match.
Conversions
WCAG contrast
| Background | Ratio | AA text | AA large | AAA text |
|---|---|---|---|---|
| white | 15.54:1 | pass | pass | pass |
| black | 1.35:1 | fail | fail | fail |
| slate-900 | 1.15:1 | fail | fail | fail |
| gray-100 | 14.12:1 | pass | pass | pass |
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 #0a2540 in real UI palettes
These colors appear alongside #0a2540 in StyleKit's curated palettes. Co-occurrence is not a promise of text readability; each pair includes its measured contrast.
- #00d4ff
Used together in Stripe Style.
8.78:1
AA normal text - #635bff
Used together in Stripe Style.
3.31:1
Not for normal text - #7a73ff
Used together in Stripe Style.
4.23:1
Not for normal text - #80e9ff
Used together in Stripe Style.
11.11:1
AA normal text
A readable starting point
white text on #0a2540: 15.54:1 contrast.
Design styles using this color
Tints and shades
Lightness ladder in HSL space, from the lightest tint to the darkest shade of #0a2540.
Similar colors in the library
Nearest swatches by perceptual OKLab distance across all curated style palettes.
AI prompt snippet
Use #0a2540 as the secondary color, following the Stripe Style style: rgb(10, 37, 64), nearest Tailwind token slate-800. Keep text contrast at least 4.5:1 (this color scores 15.54:1 on white, 1.35:1 on black).
Paste this into ChatGPT, Claude, Cursor, or v0 to use #0a2540 with correct contrast constraints. Browse all palette colors.
Questions about #0a2540
What color is #0a2540?
#0a2540 is rgb(10, 37, 64), or hsl(210, 73%, 15%). The nearest reference Tailwind v4 token is slate-800 (#1d293d), not an exact match.
What text color should I use on #0a2540?
White (#ffffff) has the higher black-or-white contrast against #0a2540: 15.54:1. 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 #0a2540 in Tailwind CSS?
Use bg-[#0a2540], text-[#0a2540], 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.