Inspect Gainsboro (#DCDCDC) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
Gainsboro
#DCDCDC
Black text reads best on this background, at 15.31:1.
Gainsboro is one of the 148 CSS named colors, and resolves to #DCDCDC in every browser. In numbers that is rgb(220, 220, 220) and hsl(0, 0%, 86%). Perceptually it is a very light, near-neutral color: OKLCH puts its lightness at 89% and its chroma at 0. It carries almost no chroma, so it behaves as a neutral rather than as a hue, and belongs with the grays.
White text only reaches 1.37:1 here, so black text is the safer pairing at 15.31:1. Because it is this light, Gainsboro works best as a page or card background with dark text over it.
The closest CSS named colors to Gainsboro, measured with CIEDE2000, are LightGray (#D3D3D3), LightGrey (#D3D3D3), WhiteSmoke (#F5F5F5). If Gainsboro is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#DCDCDC
RGB
rgb(220, 220, 220)
HSL
hsl(0, 0%, 86%)
HWB
hwb(0 86% 14%)
CMYK
cmyk(0%, 0%, 0%, 14%)
LAB
lab(87.76 0 0)
LCH
lch(87.76 0 0)
OKLCH
oklch(89.45% 0 0)
WCAG asks for 4.5:1 between body text and its background. On #DCDCDC white text measures 1.37:1 and black text 15.31:1, so black clears it and white does not.
White text on Gainsboro
WCAG 2.2
1.37:1
APCA
Lc 20
Fails AA body text
Fails AAA body text
Fails AA large text
Black text on Gainsboro
WCAG 2.2
15.31:1
APCA
Lc 85
Passes AA body text
Passes AAA body text
Passes AA large text
Check Gainsboro against any other color in the contrast checker.
Gainsboro sits at 89% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #F8F8F8 and down to #060606, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#E2E2E2
20% lighter
#E7E7E7
40% lighter
#EDEDED
60% lighter
#F3F3F3
80% lighter
#F8F8F8
100% lighter
#AAAAAA
20% darker
#7C7C7C
40% darker
#505050
60% darker
#282828
80% darker
#060606
100% darker
Build a full accessible scale from #DCDCDC in the shade generator.
Gainsboro barely moves under any of the four common forms of color blindness, the largest shift being 0 CIEDE2000 units under protanopia. It stays recognizable, though it still should not be the only thing carrying meaning.
Protanopia
#DCDCDC
Deuteranopia
#DCDCDC
Tritanopia
#DCDCDC
Achromatopsia
#DCDCDC
The nearest CSS keywords to #DCDCDC, ranked by perceptual distance rather than by how close their hex digits happen to look.