Inspect Aquamarine (#7FFFD4) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
Aquamarine
#7FFFD4
Black text reads best on this background, at 17.16:1.
Aquamarine is one of the 148 CSS named colors, and resolves to #7FFFD4 in every browser. In numbers that is rgb(127, 255, 212) and hsl(160, 100%, 75%). Perceptually it is a very light, moderately saturated color: OKLCH puts its lightness at 91% and its chroma at 0.13. It sits in the cyans at 169 degrees of OKLCH hue, and reads as a cool color.
White text only reaches 1.22:1 here, so black text is the safer pairing at 17.16:1. Because it is this light, Aquamarine works best as a page or card background with dark text over it.
The closest CSS named colors to Aquamarine, measured with CIEDE2000, are Turquoise (#40E0D0), MediumSpringGreen (#00FA9A), MediumAquaMarine (#66CDAA). If Aquamarine is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#7FFFD4
RGB
rgb(127, 255, 212)
HSL
hsl(160, 100%, 75%)
HWB
hwb(160 50% 0%)
CMYK
cmyk(50%, 0%, 17%, 0%)
LAB
lab(91.86 -44.85 9.15)
LCH
lch(91.86 45.77 168.46)
OKLCH
oklch(91.5% 0.1304 168.99)
WCAG asks for 4.5:1 between body text and its background. On #7FFFD4 white text measures 1.22:1 and black text 17.16:1, so black clears it and white does not.
White text on Aquamarine
WCAG 2.2
1.22:1
APCA
Lc 12
Fails AA body text
Fails AAA body text
Fails AA large text
Black text on Aquamarine
WCAG 2.2
17.16:1
APCA
Lc 92
Passes AA body text
Passes AAA body text
Passes AA large text
Check Aquamarine against any other color in the contrast checker.
Aquamarine sits at 91% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #E7FFF5 and down to #000805, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#9AFFDB
20% lighter
#B1FFE2
40% lighter
#C4FFE8
60% lighter
#D6FFEF
80% lighter
#E7FFF5
100% lighter
#44CAA1
20% darker
#009673
40% darker
#006149
60% darker
#003124
80% darker
#000805
100% darker
Build a full accessible scale from #7FFFD4 in the shade generator.
Hues rotated around #7FFFD4 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.
Aquamarine sits at 169 degrees. Rotating it a half turn lands on 349 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 Aquamarine at 139 and 199 degrees. They stay close enough to read as the same family, which is what you want for hover states, secondary surfaces and gradients.
169, 289 and 49 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 349 degrees, this pair flanks it at 319 and 19. You keep most of the contrast of a complementary pairing while losing the harshness.
Explore more combinations around Aquamarine on the color wheel.
The biggest shift is under deuteranopia, where #7FFFD4 reads as #DAD9D7, 24.8 CIEDE2000 units away. If Aquamarine is the only thing marking a state or a series, roughly one viewer in twelve will miss it.
Protanopia
#F4ECD2
Deuteranopia
#DAD9D7
Tritanopia
#66FFF1
Achromatopsia
#E1E1E1
The nearest CSS keywords to #7FFFD4, ranked by perceptual distance rather than by how close their hex digits happen to look.