Palettes / Colors / #283F40

#283F40 — Deep Dusty Teal

#283F40 is a teal color we call Deep Dusty Teal, closest to the named color DarkSlateGray (#2F4F4F). It belongs to the teal family.

Color name

Closest CSS keyword: darkslategray (#2F4F4F) — not an exact match. CSS darkslategray gives you #2F4F4F, a different color; use #283F40 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.

#283F40 is a cool teal color associated with freshness, clarity and balance. 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 #3F2827; it also sits naturally between #273F34 and #27323F. 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 16% · Green 25% · Blue 25%

Cyan 38% · Magenta 2% · Yellow 0% · Key 75%

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

Previews

CSS code for #283F40

.text { color: #283F40; }
.background { background-color: #283F40; }
.border { border: 3px solid #283F40; }
.text-rgb { color: rgb(40, 63, 64); }
.text-hsl { color: hsl(183, 23%, 20%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #283F40; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(40, 63, 64, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #283F40; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(40, 63, 64, 0.8); }

HTML: <p style="color:#283F40">Text here</p> · <div style="background-color:#283F40">Div content here</div>

Shades of #283F40

Tints of #283F40

Tones of #283F40

Color harmonies

Complementary — #3F2827:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #283F40: #FFFFFF.

Semi-transparent (opacity) text on #283F40

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 #283F40 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 #283F40 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

← #283F3F  ·  #283F41 →

Frequently asked questions

What color is #283F40?

#283F40 is Deep Dusty Teal, a teal color (RGB 40, 63, 64). Its closest standard named color is DarkSlateGray.

What is the RGB and HSL of #283F40?

#283F40 is RGB 40, 63, 64 — HSL 183°, 23%, 20% — CMYK 38%, 2%, 0%, 75%.

What colors go with #283F40?

Its complement is #3F2827; analogous partners are #273F34 and #27323F. It also appears in 6+ palettes in our collection.

Can I use #283F40 for text?

White text on #283F40 has a contrast ratio of 11.20:1 (passes WCAG AA); black text gives 1.88:1.