Palettes / Colors / #100B91

#100B91 — Vivid Blue

#100B91 is a blue color we call Vivid Blue, closest to the named color DarkBlue (#00008B). It belongs to the blue family.

Color name

Closest CSS keyword: darkblue (#00008B) — not an exact match. CSS darkblue gives you #00008B, a different color; use #100B91 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.

#100B91 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 #8F930B; it also sits naturally between #0B4B93 and #540B93. 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 6% · Green 4% · Blue 57%

Cyan 89% · Magenta 92% · Yellow 0% · Key 43%

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

Previews

CSS code for #100B91

.text { color: #100B91; }
.background { background-color: #100B91; }
.border { border: 3px solid #100B91; }
.text-rgb { color: rgb(16, 11, 145); }
.text-hsl { color: hsl(242, 86%, 31%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #100B91; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(16, 11, 145, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #100B91; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(16, 11, 145, 0.8); }

HTML: <p style="color:#100B91">Text here</p> · <div style="background-color:#100B91">Div content here</div>

Shades of #100B91

Tints of #100B91

Tones of #100B91

Color harmonies

Complementary — #8F930B:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #100B91: #FFFFFF.

Semi-transparent (opacity) text on #100B91

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 #100B91 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 #100B91 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

← #100B90  ·  #100B92 →

Frequently asked questions

What color is #100B91?

#100B91 is Vivid Blue, a blue color (RGB 16, 11, 145). Its closest standard named color is DarkBlue.

What is the RGB and HSL of #100B91?

#100B91 is RGB 16, 11, 145 — HSL 242°, 86%, 31% — CMYK 89%, 92%, 0%, 43%.

What colors go with #100B91?

Its complement is #8F930B; analogous partners are #0B4B93 and #540B93. It also appears in 6+ palettes in our collection.

Can I use #100B91 for text?

White text on #100B91 has a contrast ratio of 14.20:1 (passes WCAG AA); black text gives 1.48:1.