#b51721
a dark, electric red · warm · closest name: firebrick
RGB
181, 23, 33
HSL
356°, 78%, 40%
CMYK
0, 87, 82, 29
Luminance
0.1055
Every format
| HEX | #b51721 |
| RGB | rgb(181, 23, 33) |
| HSL | hsl(356, 78%, 40%) |
| CMYK | cmyk(0%, 87%, 82%, 29%) |
| LAB | lab(38.8 59.3 38.1) |
| LCH | lch(38.8 70.5 32.7) |
| OKLCH | oklch(0.495 0.189 25.5) |
Copy-ready code
/* CSS */
color: #b51721;
background-color: #b51721;
/* Tailwind (arbitrary) */
class="text-[#b51721] bg-[#b51721]"
/* SCSS */
$brand: #b51721;
/* SwiftUI */
Color(red: 0.710, green: 0.090, blue: 0.129)
/* Android */
Color.parseColor("#b51721")Accessibility — WCAG contrast
Aa
#b51721 on white: 6.75:1
AA ✓ pass · AA-large ✓ · AAA ✗
Aa
#b51721 on black: 3.11:1
AA ✗ fail · AA-large ✓ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red71.0%
Green9.0%
Blue12.9%
CMYK percentages
Cyan0.0%
Magenta87.3%
Yellow81.8%
Key (black)29.0%
Color previews
#b51721 text on a black background
contrast 3.11:1
Card sample
#b51721 text on a white background
contrast 6.75:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #b51721;
Background color
Panel with #b51721 background
background-color: #b51721;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #b51721;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(181, 23, 33, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(181, 23, 33, 0.45);
Border & gradient
Gradient panel
border: 3px solid #b51721; background: linear-gradient(135deg, #b51721, #B57617);