#21b5df
a balanced, vivid cyan · cool · closest name: skyblue
RGB
33, 181, 223
HSL
193°, 75%, 50%
CMYK
85, 19, 0, 13
Luminance
0.3870
Every format
| HEX | #21b5df |
| RGB | rgb(33, 181, 223) |
| HSL | hsl(193, 75%, 50%) |
| CMYK | cmyk(85%, 19%, 0%, 13%) |
| LAB | lab(68.5 -22.2 -31.4) |
| LCH | lch(68.5 38.5 234.8) |
| OKLCH | oklch(0.720 0.128 223.4) |
Copy-ready code
/* CSS */
color: #21b5df;
background-color: #21b5df;
/* Tailwind (arbitrary) */
class="text-[#21b5df] bg-[#21b5df]"
/* SCSS */
$brand: #21b5df;
/* SwiftUI */
Color(red: 0.129, green: 0.710, blue: 0.875)
/* Android */
Color.parseColor("#21b5df")Accessibility — WCAG contrast
Aa
#21b5df on white: 2.40:1
AA ✗ fail · AA-large ✗ · AAA ✗
Aa
#21b5df on black: 8.74:1
AA ✓ pass · AA-large ✓ · AAA ✓
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red12.9%
Green71.0%
Blue87.5%
CMYK percentages
Cyan85.2%
Magenta18.8%
Yellow0.0%
Key (black)12.5%
Color previews
#21b5df text on a black background
contrast 8.74:1
Card sample
#21b5df text on a white background
contrast 2.40:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #21b5df;
Background color
Panel with #21b5df background
background-color: #21b5df;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #21b5df;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(33, 181, 223, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(33, 181, 223, 0.45);
Border & gradient
Gradient panel
border: 3px solid #21b5df; background: linear-gradient(135deg, #21b5df, #2136DF);