#3f40df
a balanced, vivid blue · warm · closest name: slateblue
RGB
63, 64, 223
HSL
240°, 71%, 56%
CMYK
72, 71, 0, 13
Luminance
0.1005
Every format
| HEX | #3f40df |
| RGB | rgb(63, 64, 223) |
| HSL | hsl(240, 71%, 56%) |
| CMYK | cmyk(72%, 71%, 0%, 13%) |
| LAB | lab(37.9 50.3 -80.3) |
| LCH | lch(37.9 94.8 302.1) |
| OKLCH | oklch(0.486 0.233 273.3) |
Copy-ready code
/* CSS */
color: #3f40df;
background-color: #3f40df;
/* Tailwind (arbitrary) */
class="text-[#3f40df] bg-[#3f40df]"
/* SCSS */
$brand: #3f40df;
/* SwiftUI */
Color(red: 0.247, green: 0.251, blue: 0.875)
/* Android */
Color.parseColor("#3f40df")Accessibility — WCAG contrast
Aa
#3f40df on white: 6.98:1
AA ✓ pass · AA-large ✓ · AAA ✗
Aa
#3f40df on black: 3.01:1
AA ✗ fail · AA-large ✓ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red24.7%
Green25.1%
Blue87.5%
CMYK percentages
Cyan71.7%
Magenta71.3%
Yellow0.0%
Key (black)12.5%
Color previews
#3f40df text on a black background
contrast 3.01:1
Card sample
#3f40df text on a white background
contrast 6.98:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #3f40df;
Background color
Panel with #3f40df background
background-color: #3f40df;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #3f40df;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(63, 64, 223, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(63, 64, 223, 0.45);
Border & gradient
Gradient panel
border: 3px solid #3f40df; background: linear-gradient(135deg, #3f40df, #A93FDF);