#303e55 - Winter Sea color

Deep, muted slate blue with strong gray undertones, this steely navy evokes stormy skies and weathered coastal stone. Cool and restrained rather than bright, it feels sophisticated, calm, and slightly brooding—ideal for backgrounds, menswear, or minimalist interiors seeking depth without harshness. It pairs beautifully with warm accents like ochre, rust, or copper, and with soft creams or blushes to soften its intensity. Overall it conveys stability, elegance, and quiet confidence.

#303e55 color RGB value is 48, 62, 85, and the CMYK value is 0.435, 0.271, 0.00, 0.667. Alternative names for that color are: winter sea, black, darkslategray, pickled bluewood, outer space, indigo, darkslategrey.

Open Color Palette Builder Open Color Wheel

Color Conversion

Name	Values	CSS
RGB(0-255)	48, 62, 85	rgb(48, 62, 85)
CMYK	0.435, 0.271, 0.00, 0.667	-
sRGB	0.188, 0.243, 0.333	rgb(18.8%, 24.3%, 33.3%)
Adobe® 98 RGB compatible	0.217, 0.252, 0.333	color(a98-rgb, 0.217, 0.252, 0.333)
HCT	261, 20.6, 25.9	color(--hct, 261, 14.2%, 25.9%)
HSL	217, 27.8, 26.1	hsl(217, 27.8%, 26.1%)
HSV	217, 43.5, 33.3	color(--hsv, 217, 43.5%, 33.3%)
HWB	217, 18.8, 66.7	hwb(217, 18.8%, 66.7%)
Lab	25.7, -0.687, -15.9	lab(25.7%, -0.687, -15.9)
P3	0.199, 0.242, 0.326	color(display-p3, 0.199, 0.242, 0.326)
XYZ D50	0.0444, 0.0466, 0.0700	color(xyz-d50, 0.044, 0.047, 0.07)