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Running Number
6,730,107
HEX
#66B17B
RGB
102, 177, 123
HSL
137°,32%,55%
HSV
137°,42%,69%
CMYK
42%,0%,31%,31%
Brightness
58%
Type
Light
AA Normal Text: ≥ 4.5:1
AA Large Text: ≥ 3.0:1
AAA Normal Text: ≥ 7.0:1
AAA Large Text: ≥ 4.5:1
#66B17B sits at 137° on the color wheel, placing it in the spring green family of the cool half of the spectrum. With 32% saturation and 55% lightness, it reads as a softly muted, light tone — a balanced mid-energy presence that sits comfortably alongside other UI tones. Its RGB mix of 102, 177, 123 produces a 8.14:1 contrast ratio against black, which clears WCAG AAA for body text in that pairing.
In RGB space #66B17B is a clear variant of CSS gray — about 56 units away from #808080. Designers reach for spring green hues at this saturation when the brief calls for a conversational, mid-energy register, and at this lightness when they want a present, comfortable mid-canvas voice. On screen the cool cast tends to pair best with warm neutrals in the 25°-45° range to add life.
See how this color appears in real UI elements
Button (filled)
Badge
Progress Bar
Link Hover
Input Focus Ring
Checkbox Active
Toggle Switch On
Slider Thumb
Card Border
Icon Highlight
Tooltip Background
Modal Header
Tab Active
Alert Box
Timeline Dot
Loading Spinner
Dropdown Selected
Table Row Highlight
Calendar Date
Mobile Device
See how to use #66B17B in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#66b17b";💡 Click any tab to see how to use #66b17b in different programming languages