#166df4
a balanced, electric blue · cool · closest name: royalblue
RGB
22, 109, 244
HSL
217°, 91%, 52%
CMYK
91, 55, 0, 4
Luminance
0.1764
Every format
| HEX | #166df4 |
| RGB | rgb(22, 109, 244) |
| HSL | hsl(217, 91%, 52%) |
| CMYK | cmyk(91%, 55%, 0%, 4%) |
| LAB | lab(49.0 27.2 -74.0) |
| LCH | lch(49.0 78.8 290.2) |
| OKLCH | oklch(0.570 0.217 260.1) |
Copy-ready code
/* CSS */
color: #166df4;
background-color: #166df4;
/* Tailwind (arbitrary) */
class="text-[#166df4] bg-[#166df4]"
/* SCSS */
$brand: #166df4;
/* SwiftUI */
Color(red: 0.086, green: 0.427, blue: 0.957)
/* Android */
Color.parseColor("#166df4")Accessibility — WCAG contrast
Aa
#166df4 on white: 4.64:1
AA ✓ pass · AA-large ✓ · AAA ✗
Aa
#166df4 on black: 4.53:1
AA ✓ pass · AA-large ✓ · AAA ✗
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red8.6%
Green42.7%
Blue95.7%
CMYK percentages
Cyan91.0%
Magenta55.3%
Yellow0.0%
Key (black)4.3%
Color previews
#166df4 text on a black background
contrast 4.53:1
Card sample
#166df4 text on a white background
contrast 4.64:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #166df4;
Background color
Panel with #166df4 background
background-color: #166df4;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #166df4;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(22, 109, 244, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(22, 109, 244, 0.45);
Border & gradient
Gradient panel
border: 3px solid #166df4; background: linear-gradient(135deg, #166df4, #5316F4);