Inspect LightGreen (#90EE90) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
LightGreen
#90EE90
Black text reads best on this background, at 14.82:1.
LightGreen is one of the 148 CSS named colors, and resolves to #90EE90 in every browser. In numbers that is rgb(144, 238, 144) and hsl(120, 73%, 75%). Perceptually it is a light, moderately saturated color: OKLCH puts its lightness at 87% and its chroma at 0.156. It sits in the greens at 144 degrees of OKLCH hue, and reads as a cool color.
White text only reaches 1.42:1 here, so black text is the safer pairing at 14.82:1. That combination of lightness and chroma makes it a workable mid-tone, the kind of value that lands in the middle of a shade scale.
The closest CSS named colors to LightGreen, measured with CIEDE2000, are PaleGreen (#98FB98), SpringGreen (#00FF7F), MediumSpringGreen (#00FA9A). If LightGreen is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#90EE90
RGB
rgb(144, 238, 144)
HSL
hsl(120, 73%, 75%)
HWB
hwb(120 56% 7%)
CMYK
cmyk(39%, 0%, 39%, 7%)
LAB
lab(86.6 -43.02 36.39)
LCH
lch(86.6 56.35 139.77)
OKLCH
oklch(86.8% 0.1558 144.09)
WCAG asks for 4.5:1 between body text and its background. On #90EE90 white text measures 1.42:1 and black text 14.82:1, so black clears it and white does not.
White text on LightGreen
WCAG 2.2
1.42:1
APCA
Lc 22
Fails AA body text
Fails AAA body text
Fails AA large text
Black text on LightGreen
WCAG 2.2
14.82:1
APCA
Lc 83
Passes AA body text
Passes AAA body text
Passes AA large text
Check LightGreen against any other color in the contrast checker.
LightGreen sits at 87% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #EBFFEA and down to #000900, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#97F697
20% lighter
#9FFD9E
40% lighter
#B8FFB7
60% lighter
#D3FFD2
80% lighter
#EBFFEA
100% lighter
#60BD61
20% darker
#2D8D33
40% darker
#005E0F
60% darker
#003004
80% darker
#000900
100% darker
Build a full accessible scale from #90EE90 in the shade generator.
Hues rotated around #90EE90 in OKLCH, then pulled back into the sRGB gamut. Each swatch is labelled with the nearest CSS named color so you have a keyword to start from.
LightGreen sits at 144 degrees. Rotating it a half turn lands on 324 degrees, the hue directly opposite. It is the strongest pairing you can make without changing lightness, and the one most likely to vibrate if you use both at full chroma.
The neighbors of LightGreen at 114 and 174 degrees. They stay close enough to read as the same family, which is what you want for hover states, secondary surfaces and gradients.
144, 264 and 24 degrees divide the wheel into thirds. Balanced enough to carry a whole palette without one color dominating the other two.
Instead of the complement at 324 degrees, this pair flanks it at 294 and 354. You keep most of the contrast of a complementary pairing while losing the harshness.
Explore more combinations around LightGreen on the color wheel.
The biggest shift is under achromatopsia, where #90EE90 reads as #D3D3D3, 25.8 CIEDE2000 units away. If LightGreen is the only thing marking a state or a series, roughly one viewer in twelve will miss it.
Protanopia
#F3DA8B
Deuteranopia
#E1CF94
Tritanopia
#89E7D1
Achromatopsia
#D3D3D3
The nearest CSS keywords to #90EE90, ranked by perceptual distance rather than by how close their hex digits happen to look.