#40799B

Closest named color: Cerulean (#457B9D). oklch(55.2% 0.08 236.9), rgb(64, 121, 155).

White text reads best on this color (4.74:1).

About this color

#40799B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.080 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.008 away. White text reads best on it, at 4.74:1.

Hue family	Blues
Lightness	medium-dark (55%)
Chroma	moderately saturated (0.080)
Temperature	cool
Nearest name	Cerulean (#457B9D)
Black text	4.42:1
White text	4.74:1

Values

HEX	#40799B
RGB	rgb(64, 121, 155)
HSL	hsl(202, 42%, 43%)
OKLCH	oklch(55.2% 0.08 236.9)

Contrast

WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.

Pair	WCAG 2	Result	APCA	APCA guidance
White text on #40799B	4.74:1	AA	Lc -78.2	Fine for body text
Black text on #40799B	4.42:1	AA large text	Lc 31.3	Non-text elements, placeholder text
#40799B text on white	4.74:1	AA	Lc 72.8	Content text, not long reading
#40799B text on black	4.42:1	AA large text	Lc -28.9	Dividers and decoration only

Tints and shades

A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.

Step 50
50

#F3F6F8

oklch(97.1% 0.004 236.5)
Step 100
100

#E4EBF0

oklch(93.6% 0.01 238.5)
Step 200
200

#CDDBE5

oklch(88.4% 0.02 238.7)
Step 300
300

#ACC5D5

oklch(81% 0.035 236)
Step 400
400

#7FA7C0

oklch(70.8% 0.057 236.1)
Step 500
500

#5D90B1

oklch(63% 0.074 237.9)
Step 600
600 (this color)

#40799B

oklch(55.2% 0.08 236.9)
Step 700
700

#336786

oklch(49.2% 0.075 237.1)
Step 800
800

#2B546D

oklch(42.7% 0.062 237.4)
Step 900
900

#274558

oklch(37.6% 0.049 237.8)
Step 950
950

#182933

oklch(27.1% 0.029 235.2)

Export this scale for Tailwind in the Tailwind colors tool

#40799B with color blindness

Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.

Vision	Seen as	Shift (ΔE)
Protanopia (no red cones)	#69789D	0.048
Deuteranopia (no green cones)	#5D6F9A	0.040
Tritanopia (no blue cones)	#008284	0.061
Achromatopsia (no color)	#737373	0.080