#040a21
a deep, electric blue · warm · closest name: black
RGB
4, 10, 33
HSL
228°, 78%, 7%
CMYK
88, 70, 0, 87
Luminance
0.0035
Every format
| HEX | #040a21 |
| RGB | rgb(4, 10, 33) |
| HSL | hsl(228, 78%, 7%) |
| CMYK | cmyk(88%, 70%, 0%, 87%) |
| LAB | lab(3.2 4.0 -14.7) |
| LCH | lch(3.2 15.2 285.3) |
| OKLCH | oklch(0.155 0.050 266.7) |
Copy-ready code
/* CSS */
color: #040a21;
background-color: #040a21;
/* Tailwind (arbitrary) */
class="text-[#040a21] bg-[#040a21]"
/* SCSS */
$brand: #040a21;
/* SwiftUI */
Color(red: 0.016, green: 0.039, blue: 0.129)
/* Android */
Color.parseColor("#040a21")Accessibility — WCAG contrast
Aa
#040a21 on white: 19.62:1
AA ✓ pass · AA-large ✓ · AAA ✓
Aa
#040a21 on black: 1.07:1
AA ✗ fail · AA-large ✗ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red1.6%
Green3.9%
Blue12.9%
CMYK percentages
Cyan87.9%
Magenta69.7%
Yellow0.0%
Key (black)87.1%
Color previews
#040a21 text on a black background
contrast 1.07:1
Card sample
#040a21 text on a white background
contrast 19.62:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #040a21;
Background color
Panel with #040a21 background
background-color: #040a21;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #040a21;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(4, 10, 33, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(4, 10, 33, 0.45);
Border & gradient
Gradient panel
border: 3px solid #040a21; background: linear-gradient(135deg, #040a21, #110421);