#21f9da
a balanced, electric cyan · cool · closest name: aquamarine
RGB
33, 249, 218
HSL
171°, 95%, 55%
CMYK
87, 0, 12, 2
Luminance
0.7314
Every format
| HEX | #21f9da |
| RGB | rgb(33, 249, 218) |
| HSL | hsl(171, 95%, 55%) |
| CMYK | cmyk(87%, 0%, 12%, 2%) |
| LAB | lab(88.5 -54.7 1.3) |
| LCH | lch(88.5 54.7 178.7) |
| OKLCH | oklch(0.881 0.157 179.1) |
Copy-ready code
/* CSS */
color: #21f9da;
background-color: #21f9da;
/* Tailwind (arbitrary) */
class="text-[#21f9da] bg-[#21f9da]"
/* SCSS */
$brand: #21f9da;
/* SwiftUI */
Color(red: 0.129, green: 0.976, blue: 0.855)
/* Android */
Color.parseColor("#21f9da")Accessibility — WCAG contrast
Aa
#21f9da on white: 1.34:1
AA ✗ fail · AA-large ✗ · AAA ✗
Aa
#21f9da on black: 15.63:1
AA ✓ pass · AA-large ✓ · AAA ✓
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red12.9%
Green97.6%
Blue85.5%
CMYK percentages
Cyan86.7%
Magenta0.0%
Yellow12.4%
Key (black)2.4%
Color previews
#21f9da text on a black background
contrast 15.63:1
Card sample
#21f9da text on a white background
contrast 1.34:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #21f9da;
Background color
Panel with #21f9da background
background-color: #21f9da;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #21f9da;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(33, 249, 218, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(33, 249, 218, 0.45);
Border & gradient
Gradient panel
border: 3px solid #21f9da; background: linear-gradient(135deg, #21f9da, #2188F9);