Palettes / Colors / #255FBB

#255FBB — Blue

#255FBB 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 #255FBB 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.

#255FBB 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 #BB8225; it also sits naturally between #25AABB and #3725BB. 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 15% · Green 37% · Blue 73%

Cyan 80% · Magenta 49% · Yellow 0% · Key 27%

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

Previews

CSS code for #255FBB

.text { color: #255FBB; }
.background { background-color: #255FBB; }
.border { border: 3px solid #255FBB; }
.text-rgb { color: rgb(37, 95, 187); }
.text-hsl { color: hsl(217, 67%, 44%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #255FBB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(37, 95, 187, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #255FBB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(37, 95, 187, 0.8); }

HTML: <p style="color:#255FBB">Text here</p> · <div style="background-color:#255FBB">Div content here</div>

Shades of #255FBB

Tints of #255FBB

Tones of #255FBB

Color harmonies

Complementary — #BB8225:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #255FBB: #FFFFFF.

Semi-transparent (opacity) text on #255FBB

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 #255FBB 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 #255FBB 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

← #255FBA  ·  #255FBC →

Frequently asked questions

What color is #255FBB?

#255FBB is Blue, a blue color (RGB 37, 95, 187). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #255FBB?

#255FBB is RGB 37, 95, 187 — HSL 217°, 67%, 44% — CMYK 80%, 49%, 0%, 27%.

What colors go with #255FBB?

Its complement is #BB8225; analogous partners are #25AABB and #3725BB. It also appears in 6+ palettes in our collection.

Can I use #255FBB for text?

White text on #255FBB has a contrast ratio of 6.12:1 (passes WCAG AA); black text gives 3.43:1.