#a31b00
a dark, electric red · warm · closest name: firebrick
RGB
163, 27, 0
HSL
10°, 100%, 32%
CMYK
0, 83, 100, 36
Luminance
0.0857
Every format
| HEX | #a31b00 |
| RGB | rgb(163, 27, 0) |
| HSL | hsl(10, 100%, 32%) |
| CMYK | cmyk(0%, 83%, 100%, 36%) |
| LAB | lab(35.1 52.7 48.6) |
| LCH | lch(35.1 71.7 42.7) |
| OKLCH | oklch(0.461 0.173 32.3) |
Copy-ready code
/* CSS */
color: #a31b00;
background-color: #a31b00;
/* Tailwind (arbitrary) */
class="text-[#a31b00] bg-[#a31b00]"
/* SCSS */
$brand: #a31b00;
/* SwiftUI */
Color(red: 0.639, green: 0.106, blue: 0.000)
/* Android */
Color.parseColor("#a31b00")Accessibility — WCAG contrast
Aa
#a31b00 on white: 7.74:1
AA ✓ pass · AA-large ✓ · AAA ✓
Aa
#a31b00 on black: 2.71:1
AA ✗ fail · AA-large ✗ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red63.9%
Green10.6%
Blue0.0%
CMYK percentages
Cyan0.0%
Magenta83.4%
Yellow100.0%
Key (black)36.1%
Color previews
#a31b00 text on a black background
contrast 2.71:1
Card sample
#a31b00 text on a white background
contrast 7.74:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #a31b00;
Background color
Panel with #a31b00 background
background-color: #a31b00;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #a31b00;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(163, 27, 0, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(163, 27, 0, 0.45);
Border & gradient
Gradient panel
border: 3px solid #a31b00; background: linear-gradient(135deg, #a31b00, #A38800);