#3740df
a balanced, vivid blue · warm · closest name: slateblue
RGB
55, 64, 223
HSL
237°, 72%, 55%
CMYK
75, 71, 0, 13
Luminance
0.0981
Every format
| HEX | #3740df |
| RGB | rgb(55, 64, 223) |
| HSL | hsl(237, 72%, 55%) |
| CMYK | cmyk(75%, 71%, 0%, 13%) |
| LAB | lab(37.5 49.6 -81.0) |
| LCH | lch(37.5 95.0 301.5) |
| OKLCH | oklch(0.482 0.235 271.2) |
Copy-ready code
/* CSS */
color: #3740df;
background-color: #3740df;
/* Tailwind (arbitrary) */
class="text-[#3740df] bg-[#3740df]"
/* SCSS */
$brand: #3740df;
/* SwiftUI */
Color(red: 0.216, green: 0.251, blue: 0.875)
/* Android */
Color.parseColor("#3740df")Accessibility — WCAG contrast
Aa
#3740df on white: 7.09:1
AA ✓ pass · AA-large ✓ · AAA ✓
Aa
#3740df on black: 2.96:1
AA ✗ fail · AA-large ✗ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red21.6%
Green25.1%
Blue87.5%
CMYK percentages
Cyan75.3%
Magenta71.3%
Yellow0.0%
Key (black)12.5%
Color previews
#3740df text on a black background
contrast 2.96:1
Card sample
#3740df text on a white background
contrast 7.09:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #3740df;
Background color
Panel with #3740df background
background-color: #3740df;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #3740df;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(55, 64, 223, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(55, 64, 223, 0.45);
Border & gradient
Gradient panel
border: 3px solid #3740df; background: linear-gradient(135deg, #3740df, #9E37DF);