#efff21
a balanced, electric yellow · cool · closest name: yellow
RGB
239, 255, 33
HSL
64°, 100%, 57%
CMYK
6, 0, 87, 0
Luminance
0.8998
Every format
| HEX | #efff21 |
| RGB | rgb(239, 255, 33) |
| HSL | hsl(64, 100%, 57%) |
| CMYK | cmyk(6%, 0%, 87%, 0%) |
| LAB | lab(96.0 -27.7 89.7) |
| LCH | lch(96.0 93.9 107.2) |
| OKLCH | oklch(0.956 0.210 114.4) |
Copy-ready code
/* CSS */
color: #efff21;
background-color: #efff21;
/* Tailwind (arbitrary) */
class="text-[#efff21] bg-[#efff21]"
/* SCSS */
$brand: #efff21;
/* SwiftUI */
Color(red: 0.937, green: 1.000, blue: 0.129)
/* Android */
Color.parseColor("#efff21")Accessibility — WCAG contrast
Aa
#efff21 on white: 1.11:1
AA ✗ fail · AA-large ✗ · AAA ✗
Aa
#efff21 on black: 19.00:1
AA ✓ pass · AA-large ✓ · AAA ✓
true color
protanopia
deuteranopia
tritanopia
RGB percentages
Red93.7%
Green100.0%
Blue12.9%
CMYK percentages
Cyan6.3%
Magenta0.0%
Yellow87.1%
Key (black)0.0%
Color previews
#efff21 text on a black background
contrast 19.00:1
Card sample
#efff21 text on a white background
contrast 1.11:1
Card sample
CSS3 live lab
Text font color
The quick brown fox
color: #efff21;
Background color
Panel with #efff21 background
background-color: #efff21;
Text shadow — hex
Glowing headline
text-shadow: 2px 2px 8px #efff21;
Text shadow — RGB
Soft neon halo
text-shadow: 0 0 14px rgba(239, 255, 33, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(239, 255, 33, 0.45);
Border & gradient
Gradient panel
border: 3px solid #efff21; background: linear-gradient(135deg, #efff21, #5BFF21);