Inspect DarkSlateGray (#2F4F4F) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
DarkSlateGray
#2F4F4F
White text reads best on this background, at 8.93:1.
DarkSlateGray is one of the 148 CSS named colors, and resolves to #2F4F4F in every browser. In numbers that is rgb(47, 79, 79) and hsl(180, 25%, 25%). Perceptually it is a dark, near-neutral color: OKLCH puts its lightness at 40% and its chroma at 0.038. It sits in the cyans at 196 degrees of OKLCH hue, and reads as a neutral color.
White text clears WCAG AA on a DarkSlateGray background at 8.93:1, and AAA as well. With this little chroma it recedes, which makes it useful for borders, dividers and secondary surfaces.
The closest CSS named colors to DarkSlateGray, measured with CIEDE2000, are DimGray (#696969), DimGrey (#696969), Teal (#008080). If DarkSlateGray is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#2F4F4F
RGB
rgb(47, 79, 79)
HSL
hsl(180, 25%, 25%)
HWB
hwb(180 18% 69%)
CMYK
cmyk(41%, 0%, 0%, 69%)
LAB
lab(31.14 -12.26 -3.94)
LCH
lch(31.14 12.88 197.8)
OKLCH
oklch(40.3% 0.0377 195.76)
WCAG asks for 4.5:1 between body text and its background. On #2F4F4F white text measures 8.93:1 and black text 2.35:1, so white clears it and black does not.
White text on DarkSlateGray
WCAG 2.2
8.93:1
APCA
Lc 94
Passes AA body text
Passes AAA body text
Passes AA large text
Black text on DarkSlateGray
WCAG 2.2
2.35:1
APCA
Lc 13
Fails AA body text
Fails AAA body text
Fails AA large text
Check DarkSlateGray against any other color in the contrast checker.
DarkSlateGray sits at 40% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #E3FFFF and down to #000808, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#4F706F
20% lighter
#709292
40% lighter
#93B6B5
60% lighter
#B7DBDA
80% lighter
#E3FFFF
100% lighter
#204040
20% darker
#113131
40% darker
#022323
60% darker
#001515
80% darker
#000808
100% darker
Build a full accessible scale from #2F4F4F in the shade generator.
Hues rotated around #2F4F4F 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.
DarkSlateGray sits at 196 degrees. Rotating it a half turn lands on 16 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 DarkSlateGray at 166 and 226 degrees. They stay close enough to read as the same family, which is what you want for hover states, secondary surfaces and gradients.
196, 316 and 76 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 16 degrees, this pair flanks it at 346 and 46. You keep most of the contrast of a complementary pairing while losing the harshness.
Explore more combinations around DarkSlateGray on the color wheel.
The biggest shift is under deuteranopia, where #2F4F4F reads as #43464F, 14 CIEDE2000 units away. If DarkSlateGray is the only thing marking a state or a series, roughly one viewer in twelve will miss it.
Protanopia
#4A4B4F
Deuteranopia
#43464F
Tritanopia
#27524F
Achromatopsia
#484848
The nearest CSS keywords to #2F4F4F, ranked by perceptual distance rather than by how close their hex digits happen to look.