#21ddf3
a balanced, electric cyan · cool · closest name: cyan
RGB
33, 221, 243
HSL
186°, 90%, 54%
CMYK
86, 9, 0, 5
Luminance
0.5851
Every format
| HEX | #21ddf3 |
| RGB | rgb(33, 221, 243) |
| HSL | hsl(186, 90%, 54%) |
| CMYK | cmyk(86%, 9%, 0%, 5%) |
| LAB | lab(81.0 -35.4 -23.1) |
| LCH | lch(81.0 42.2 213.1) |
| OKLCH | oklch(0.823 0.137 207.9) |
Copy-ready code
/* CSS */
color: #21ddf3;
background-color: #21ddf3;
/* Tailwind (arbitrary) */
class="text-[#21ddf3] bg-[#21ddf3]"
/* SCSS */
$brand: #21ddf3;
/* SwiftUI */
Color(red: 0.129, green: 0.867, blue: 0.953)
/* Android */
Color.parseColor("#21ddf3")Accessibility — WCAG contrast
Aa
#21ddf3 on white: 1.65:1
AA ✗ fail · AA-large ✗ · AAA ✗
Aa
#21ddf3 on black: 12.70:1
AA ✓ pass · AA-large ✓ · AAA ✓
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red12.9%
Green86.7%
Blue95.3%
CMYK percentages
Cyan86.4%
Magenta9.1%
Yellow0.0%
Key (black)4.7%
Color previews
#21ddf3 text on a black background
contrast 12.70:1
Card sample
#21ddf3 text on a white background
contrast 1.65:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #21ddf3;
Background color
Panel with #21ddf3 background
background-color: #21ddf3;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #21ddf3;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(33, 221, 243, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(33, 221, 243, 0.45);
Border & gradient
Gradient panel
border: 3px solid #21ddf3; background: linear-gradient(135deg, #21ddf3, #2151F3);