Palettes / Colors / #331D99

#331D99 — Blue

#331D99 is a blue color we call Blue, closest to the named color DarkSlateBlue (#483D8B). It belongs to the blue family.

Color name

Closest CSS keyword: darkslateblue (#483D8B) — not an exact match. CSS darkslateblue gives you #483D8B, a different color; use #331D99 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.

#331D99 is a cool blue color associated with trust, calm and professionalism. It is saturated enough to be the accent — buttons, highlights and calls to action — while neutrals do the quiet work around it.

Its strongest partner is its complement #839A1D; it also sits naturally between #1D459A and #731D9A. 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 20% · Green 11% · Blue 60%

Cyan 67% · Magenta 81% · Yellow 0% · Key 40%

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

Previews

CSS code for #331D99

.text { color: #331D99; }
.background { background-color: #331D99; }
.border { border: 3px solid #331D99; }
.text-rgb { color: rgb(51, 29, 153); }
.text-hsl { color: hsl(251, 68%, 36%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #331D99; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(51, 29, 153, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #331D99; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(51, 29, 153, 0.8); }

HTML: <p style="color:#331D99">Text here</p> · <div style="background-color:#331D99">Div content here</div>

Shades of #331D99

Tints of #331D99

Tones of #331D99

Color harmonies

Complementary — #839A1D:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #331D99: #FFFFFF.

Semi-transparent (opacity) text on #331D99

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 #331D99 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 #331D99 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

← #331D98  ·  #331D9A →

Frequently asked questions

What color is #331D99?

#331D99 is Blue, a blue color (RGB 51, 29, 153). Its closest standard named color is DarkSlateBlue.

What is the RGB and HSL of #331D99?

#331D99 is RGB 51, 29, 153 — HSL 251°, 68%, 36% — CMYK 67%, 81%, 0%, 40%.

What colors go with #331D99?

Its complement is #839A1D; analogous partners are #1D459A and #731D9A. It also appears in 6+ palettes in our collection.

Can I use #331D99 for text?

White text on #331D99 has a contrast ratio of 11.82:1 (passes WCAG AA); black text gives 1.78:1.