Palettes / Colors / #040FDB

#040FDB — Vivid Blue

#040FDB 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 #040FDB 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.

#040FDB 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 #DCD104; it also sits naturally between #047BDC and #6504DC. 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 6% · Blue 86%

Cyan 98% · Magenta 93% · Yellow 0% · Key 14%

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

Previews

CSS code for #040FDB

.text { color: #040FDB; }
.background { background-color: #040FDB; }
.border { border: 3px solid #040FDB; }
.text-rgb { color: rgb(4, 15, 219); }
.text-hsl { color: hsl(237, 96%, 44%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #040FDB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(4, 15, 219, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #040FDB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(4, 15, 219, 0.8); }

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

Shades of #040FDB

Tints of #040FDB

Tones of #040FDB

Color harmonies

Complementary — #DCD104:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #040FDB: #FFFFFF.

Semi-transparent (opacity) text on #040FDB

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 #040FDB 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 #040FDB 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

← #040FDA  ·  #040FDC →

Frequently asked questions

What color is #040FDB?

#040FDB is Vivid Blue, a blue color (RGB 4, 15, 219). Its closest standard named color is Blue.

What is the RGB and HSL of #040FDB?

#040FDB is RGB 4, 15, 219 — HSL 237°, 96%, 44% — CMYK 98%, 93%, 0%, 14%.

What colors go with #040FDB?

Its complement is #DCD104; analogous partners are #047BDC and #6504DC. It also appears in 6+ palettes in our collection.

Can I use #040FDB for text?

White text on #040FDB has a contrast ratio of 10.02:1 (passes WCAG AA); black text gives 2.10:1.