Palettes / Colors / #040BCB

#040BCB — Vivid Blue

#040BCB is a blue color we call Vivid Blue, closest to the named color Blue (#0000FF). It belongs to the blue family.

Color name

Closest CSS keyword: blue (#0000FF) — not an exact match. CSS blue gives you #0000FF, a different color; use #040BCB 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.

#040BCB 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 #CDC604; it also sits naturally between #046FCD and #6204CD. 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 2% · Green 4% · Blue 80%

Cyan 98% · Magenta 95% · Yellow 0% · Key 20%

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

Previews

CSS code for #040BCB

.text { color: #040BCB; }
.background { background-color: #040BCB; }
.border { border: 3px solid #040BCB; }
.text-rgb { color: rgb(4, 11, 203); }
.text-hsl { color: hsl(238, 96%, 41%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #040BCB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(4, 11, 203, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #040BCB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(4, 11, 203, 0.8); }

HTML: <p style="color:#040BCB">Text here</p> · <div style="background-color:#040BCB">Div content here</div>

Shades of #040BCB

Tints of #040BCB

Tones of #040BCB

Color harmonies

Complementary — #CDC604:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #040BCB: #FFFFFF.

Semi-transparent (opacity) text on #040BCB

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 #040BCB 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 #040BCB 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

← #040BCA  ·  #040BCC →

Frequently asked questions

What color is #040BCB?

#040BCB is Vivid Blue, a blue color (RGB 4, 11, 203). Its closest standard named color is Blue.

What is the RGB and HSL of #040BCB?

#040BCB is RGB 4, 11, 203 — HSL 238°, 96%, 41% — CMYK 98%, 95%, 0%, 20%.

What colors go with #040BCB?

Its complement is #CDC604; analogous partners are #046FCD and #6204CD. It also appears in 6+ palettes in our collection.

Can I use #040BCB for text?

White text on #040BCB has a contrast ratio of 10.96:1 (passes WCAG AA); black text gives 1.92:1.