#0366df
a dark, electric blue · cool · closest name: royalblue
RGB
3, 102, 223
HSL
213°, 97%, 44%
CMYK
99, 54, 0, 13
Luminance
0.1485
Every format
| HEX | #0366df |
| RGB | rgb(3, 102, 223) |
| HSL | hsl(213, 97%, 44%) |
| CMYK | cmyk(99%, 54%, 0%, 13%) |
| LAB | lab(45.4 22.9 -68.1) |
| LCH | lch(45.4 71.8 288.6) |
| OKLCH | oklch(0.537 0.201 258.4) |
Copy-ready code
/* CSS */
color: #0366df;
background-color: #0366df;
/* Tailwind (arbitrary) */
class="text-[#0366df] bg-[#0366df]"
/* SCSS */
$brand: #0366df;
/* SwiftUI */
Color(red: 0.012, green: 0.400, blue: 0.875)
/* Android */
Color.parseColor("#0366df")Accessibility — WCAG contrast
Aa
#0366df on white: 5.29:1
AA ✓ pass · AA-large ✓ · AAA ✗
Aa
#0366df on black: 3.97:1
AA ✗ fail · AA-large ✓ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red1.2%
Green40.0%
Blue87.5%
CMYK percentages
Cyan98.7%
Magenta54.3%
Yellow0.0%
Key (black)12.5%
Color previews
#0366df text on a black background
contrast 3.97:1
Card sample
#0366df text on a white background
contrast 5.29:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #0366df;
Background color
Panel with #0366df background
background-color: #0366df;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #0366df;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(3, 102, 223, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(3, 102, 223, 0.45);
Border & gradient
Gradient panel
border: 3px solid #0366df; background: linear-gradient(135deg, #0366df, #3303DF);