#bb0000
a dark, electric red · warm · closest name: firebrick
RGB
187, 0, 0
HSL
0°, 100%, 37%
CMYK
0, 100, 100, 27
Luminance
0.1056
Every format
| HEX | #bb0000 |
| RGB | rgb(187, 0, 0) |
| HSL | hsl(0, 100%, 37%) |
| CMYK | cmyk(0%, 100%, 100%, 27%) |
| LAB | lab(38.8 63.4 53.2) |
| LCH | lch(38.8 82.8 40.0) |
| OKLCH | oklch(0.497 0.204 29.2) |
Copy-ready code
/* CSS */
color: #bb0000;
background-color: #bb0000;
/* Tailwind (arbitrary) */
class="text-[#bb0000] bg-[#bb0000]"
/* SCSS */
$brand: #bb0000;
/* SwiftUI */
Color(red: 0.733, green: 0.000, blue: 0.000)
/* Android */
Color.parseColor("#bb0000")Accessibility — WCAG contrast
Aa
#bb0000 on white: 6.75:1
AA ✓ pass · AA-large ✓ · AAA ✗
Aa
#bb0000 on black: 3.11:1
AA ✗ fail · AA-large ✓ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red73.3%
Green0.0%
Blue0.0%
CMYK percentages
Cyan0.0%
Magenta100.0%
Yellow100.0%
Key (black)26.7%
Color previews
#bb0000 text on a black background
contrast 3.11:1
Card sample
#bb0000 text on a white background
contrast 6.75:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #bb0000;
Background color
Panel with #bb0000 background
background-color: #bb0000;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #bb0000;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(187, 0, 0, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(187, 0, 0, 0.45);
Border & gradient
Gradient panel
border: 3px solid #bb0000; background: linear-gradient(135deg, #bb0000, #BB7D00);