Palettes / Colors / #18283F

#18283F — Deep Muted Blue

#18283F is a blue color we call Deep Muted Blue, closest to the named color DarkSlateGray (#2F4F4F). It belongs to the blue family.

Color name

Closest CSS keyword: darkslategray (#2F4F4F) — not an exact match. CSS darkslategray gives you #2F4F4F, a different color; use #18283F when you need this exact shade.

Sources: common names follow widely used color-name references; CSS keywords and their hex values follow the CSS Color specification.

#18283F is a cool blue color associated with trust, calm and professionalism. It is deep enough for text, outlines and dark interface surfaces, and makes light colors glow next to it.

Its strongest partner is its complement #3F2F18; it also sits naturally between #183C3F and #1B183F. In the palettes below you can see it working alongside real color combinations from our collection.

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Color values

RGB & CMYK percentages

Red 9% · Green 16% · Blue 25%

Cyan 62% · Magenta 37% · Yellow 0% · Key 75%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #18283F

.text { color: #18283F; }
.background { background-color: #18283F; }
.border { border: 3px solid #18283F; }
.text-rgb { color: rgb(24, 40, 63); }
.text-hsl { color: hsl(215, 45%, 17%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #18283F; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(24, 40, 63, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #18283F; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(24, 40, 63, 0.8); }

HTML: <p style="color:#18283F">Text here</p> · <div style="background-color:#18283F">Div content here</div>

Shades of #18283F

Tints of #18283F

Tones of #18283F

Color harmonies

Complementary — #3F2F18:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #18283F: #FFFFFF.

Semi-transparent (opacity) text on #18283F

Text set with opacity blends into the background, so its real contrast is lower than the solid ratios above. Choose a text color and an opacity to see the blended color and its true ratio:

How #18283F looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with a similar color

These palettes use a close neighbour of #18283F rather than the exact color:

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #18283E  ·  #182840 →

Frequently asked questions

What color is #18283F?

#18283F is Deep Muted Blue, a blue color (RGB 24, 40, 63). Its closest standard named color is DarkSlateGray.

What is the RGB and HSL of #18283F?

#18283F is RGB 24, 40, 63 — HSL 215°, 45%, 17% — CMYK 62%, 37%, 0%, 75%.

What colors go with #18283F?

Its complement is #3F2F18; analogous partners are #183C3F and #1B183F. It also appears in 6+ palettes in our collection.

Can I use #18283F for text?

White text on #18283F has a contrast ratio of 14.85:1 (passes WCAG AA); black text gives 1.41:1.