#0366db
a dark, electric blue · cool · closest name: royalblue
RGB
3, 102, 219
HSL
213°, 97%, 44%
CMYK
99, 53, 0, 14
Luminance
0.1464
Every format
| HEX | #0366db |
| RGB | rgb(3, 102, 219) |
| HSL | hsl(213, 97%, 44%) |
| CMYK | cmyk(99%, 53%, 0%, 14%) |
| LAB | lab(45.1 21.3 -66.3) |
| LCH | lch(45.1 69.7 287.8) |
| OKLCH | oklch(0.534 0.196 258.0) |
Copy-ready code
/* CSS */
color: #0366db;
background-color: #0366db;
/* Tailwind (arbitrary) */
class="text-[#0366db] bg-[#0366db]"
/* SCSS */
$brand: #0366db;
/* SwiftUI */
Color(red: 0.012, green: 0.400, blue: 0.859)
/* Android */
Color.parseColor("#0366db")Accessibility — WCAG contrast
Aa
#0366db on white: 5.35:1
AA ✓ pass · AA-large ✓ · AAA ✗
Aa
#0366db on black: 3.93:1
AA ✗ fail · AA-large ✓ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red1.2%
Green40.0%
Blue85.9%
CMYK percentages
Cyan98.6%
Magenta53.4%
Yellow0.0%
Key (black)14.1%
Color previews
#0366db text on a black background
contrast 3.93:1
Card sample
#0366db text on a white background
contrast 5.35:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #0366db;
Background color
Panel with #0366db background
background-color: #0366db;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #0366db;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(3, 102, 219, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(3, 102, 219, 0.45);
Border & gradient
Gradient panel
border: 3px solid #0366db; background: linear-gradient(135deg, #0366db, #3003DB);