#ff0303
a balanced, electric red · warm · “red”
RGB
255, 3, 3
HSL
0°, 100%, 51%
CMYK
0, 99, 99, 0
Luminance
0.2133
Every format
| HEX | #ff0303 |
| RGB | rgb(255, 3, 3) |
| HSL | hsl(0, 100%, 51%) |
| CMYK | cmyk(0%, 99%, 99%, 0%) |
| LAB | lab(53.3 79.9 66.5) |
| LCH | lch(53.3 104.0 39.8) |
| OKLCH | oklch(0.629 0.257 29.2) |
Copy-ready code
/* CSS */
color: #ff0303;
background-color: #ff0303;
/* Tailwind (arbitrary) */
class="text-[#ff0303] bg-[#ff0303]"
/* SCSS */
$brand: #ff0303;
/* SwiftUI */
Color(red: 1.000, green: 0.012, blue: 0.012)
/* Android */
Color.parseColor("#ff0303")Accessibility — WCAG contrast
Aa
#ff0303 on white: 3.99:1
AA ✗ fail · AA-large ✓ · AAA ✗
Aa
#ff0303 on black: 5.27:1
AA ✓ pass · AA-large ✓ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red100.0%
Green1.2%
Blue1.2%
CMYK percentages
Cyan0.0%
Magenta98.8%
Yellow98.8%
Key (black)0.0%
Color previews
#ff0303 text on a black background
contrast 5.27:1
Card sample
#ff0303 text on a white background
contrast 3.99:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #ff0303;
Background color
Panel with #ff0303 background
background-color: #ff0303;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #ff0303;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(255, 3, 3, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(255, 3, 3, 0.45);
Border & gradient
Gradient panel
border: 3px solid #ff0303; background: linear-gradient(135deg, #ff0303, #FFAB03);