#21fdf4
a balanced, electric cyan · cool · closest name: cyan
RGB
33, 253, 244
HSL
178°, 98%, 56%
CMYK
87, 0, 4, 1
Luminance
0.7711
Every format
| HEX | #21fdf4 |
| RGB | rgb(33, 253, 244) |
| HSL | hsl(178, 98%, 56%) |
| CMYK | cmyk(87%, 0%, 4%, 1%) |
| LAB | lab(90.4 -49.4 -9.5) |
| LCH | lch(90.4 50.3 190.9) |
| OKLCH | oklch(0.899 0.152 190.1) |
Copy-ready code
/* CSS */
color: #21fdf4;
background-color: #21fdf4;
/* Tailwind (arbitrary) */
class="text-[#21fdf4] bg-[#21fdf4]"
/* SCSS */
$brand: #21fdf4;
/* SwiftUI */
Color(red: 0.129, green: 0.992, blue: 0.957)
/* Android */
Color.parseColor("#21fdf4")Accessibility — WCAG contrast
Aa
#21fdf4 on white: 1.28:1
AA ✗ fail · AA-large ✗ · AAA ✗
Aa
#21fdf4 on black: 16.42:1
AA ✓ pass · AA-large ✓ · AAA ✓
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red12.9%
Green99.2%
Blue95.7%
CMYK percentages
Cyan87.0%
Magenta0.0%
Yellow3.6%
Key (black)0.8%
Color previews
#21fdf4 text on a black background
contrast 16.42:1
Card sample
#21fdf4 text on a white background
contrast 1.28:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #21fdf4;
Background color
Panel with #21fdf4 background
background-color: #21fdf4;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #21fdf4;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(33, 253, 244, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(33, 253, 244, 0.45);
Border & gradient
Gradient panel
border: 3px solid #21fdf4; background: linear-gradient(135deg, #21fdf4, #2174FD);