Palettes / Colors / #100A8A

#100A8A — Vivid Blue

#100A8A 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 #100A8A 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.

#100A8A 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 #838A0A; it also sits naturally between #0A448A and #500A8A. 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 54%

Cyan 88% · Magenta 93% · Yellow 0% · Key 46%

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

Previews

CSS code for #100A8A

.text { color: #100A8A; }
.background { background-color: #100A8A; }
.border { border: 3px solid #100A8A; }
.text-rgb { color: rgb(16, 10, 138); }
.text-hsl { color: hsl(243, 86%, 29%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #100A8A; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(16, 10, 138, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #100A8A; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(16, 10, 138, 0.8); }

HTML: <p style="color:#100A8A">Text here</p> · <div style="background-color:#100A8A">Div content here</div>

Shades of #100A8A

Tints of #100A8A

Tones of #100A8A

Color harmonies

Complementary — #838A0A:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #100A8A: #FFFFFF.

Semi-transparent (opacity) text on #100A8A

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 #100A8A 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 #100A8A 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

← #100A89  ·  #100A8B →

Frequently asked questions

What color is #100A8A?

#100A8A is Vivid Blue, a blue color (RGB 16, 10, 138). Its closest standard named color is DarkBlue.

What is the RGB and HSL of #100A8A?

#100A8A is RGB 16, 10, 138 — HSL 243°, 86%, 29% — CMYK 88%, 93%, 0%, 46%.

What colors go with #100A8A?

Its complement is #838A0A; analogous partners are #0A448A and #500A8A. It also appears in 6+ palettes in our collection.

Can I use #100A8A for text?

White text on #100A8A has a contrast ratio of 14.66:1 (passes WCAG AA); black text gives 1.43:1.