#040f21
a deep, electric blue · cool · closest name: black
RGB
4, 15, 33
HSL
217°, 78%, 7%
CMYK
88, 55, 0, 87
Luminance
0.0048
Every format
| HEX | #040f21 |
| RGB | rgb(4, 15, 33) |
| HSL | hsl(217, 78%, 7%) |
| CMYK | cmyk(88%, 55%, 0%, 87%) |
| LAB | lab(4.3 1.7 -13.0) |
| LCH | lch(4.3 13.1 277.5) |
| OKLCH | oklch(0.169 0.042 257.6) |
Copy-ready code
/* CSS */
color: #040f21;
background-color: #040f21;
/* Tailwind (arbitrary) */
class="text-[#040f21] bg-[#040f21]"
/* SCSS */
$brand: #040f21;
/* SwiftUI */
Color(red: 0.016, green: 0.059, blue: 0.129)
/* Android */
Color.parseColor("#040f21")Accessibility — WCAG contrast
Aa
#040f21 on white: 19.17:1
AA ✓ pass · AA-large ✓ · AAA ✓
Aa
#040f21 on black: 1.10:1
AA ✗ fail · AA-large ✗ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red1.6%
Green5.9%
Blue12.9%
CMYK percentages
Cyan87.9%
Magenta54.5%
Yellow0.0%
Key (black)87.1%
Color previews
#040f21 text on a black background
contrast 1.10:1
Card sample
#040f21 text on a white background
contrast 19.17:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #040f21;
Background color
Panel with #040f21 background
background-color: #040f21;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #040f21;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(4, 15, 33, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(4, 15, 33, 0.45);
Border & gradient
Gradient panel
border: 3px solid #040f21; background: linear-gradient(135deg, #040f21, #0C0421);