Palettes / Colors / #403FCB

#403FCB — Blue

#403FCB is a blue color we call Blue, closest to the named color RoyalBlue (#4169E1). It belongs to the blue family.

Color name

Closest CSS keyword: royalblue (#4169E1) — not an exact match. CSS royalblue gives you #4169E1, a different color; use #403FCB 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.

#403FCB is a cool blue color associated with trust, calm and professionalism. It sits comfortably in the middle: usable for large areas in soft schemes, or as a supporting color beside something stronger.

Its strongest partner is its complement #CACA3F; it also sits naturally between #3F85CA and #853FCA. 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 25% · Green 25% · Blue 80%

Cyan 68% · Magenta 69% · Yellow 0% · Key 20%

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

Previews

CSS code for #403FCB

.text { color: #403FCB; }
.background { background-color: #403FCB; }
.border { border: 3px solid #403FCB; }
.text-rgb { color: rgb(64, 63, 203); }
.text-hsl { color: hsl(240, 57%, 52%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #403FCB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(64, 63, 203, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #403FCB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(64, 63, 203, 0.8); }

HTML: <p style="color:#403FCB">Text here</p> · <div style="background-color:#403FCB">Div content here</div>

Shades of #403FCB

Tints of #403FCB

Tones of #403FCB

Color harmonies

Complementary — #CACA3F:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #403FCB: #FFFFFF.

Semi-transparent (opacity) text on #403FCB

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 #403FCB 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 #403FCB 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

← #403FCA  ·  #403FCC →

Frequently asked questions

What color is #403FCB?

#403FCB is Blue, a blue color (RGB 64, 63, 203). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #403FCB?

#403FCB is RGB 64, 63, 203 — HSL 240°, 57%, 52% — CMYK 68%, 69%, 0%, 20%.

What colors go with #403FCB?

Its complement is #CACA3F; analogous partners are #3F85CA and #853FCA. It also appears in 6+ palettes in our collection.

Can I use #403FCB for text?

White text on #403FCB has a contrast ratio of 7.52:1 (passes WCAG AA); black text gives 2.79:1.