Palettes / Colors / #377BCD

#377BCD — Blue

#377BCD 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 #377BCD 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.

#377BCD 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 #CD8A37; it also sits naturally between #37C6CD and #3F37CD. 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 22% · Green 48% · Blue 80%

Cyan 73% · Magenta 40% · Yellow 0% · Key 20%

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

Previews

CSS code for #377BCD

.text { color: #377BCD; }
.background { background-color: #377BCD; }
.border { border: 3px solid #377BCD; }
.text-rgb { color: rgb(55, 123, 205); }
.text-hsl { color: hsl(213, 60%, 51%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #377BCD; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(55, 123, 205, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #377BCD; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(55, 123, 205, 0.8); }

HTML: <p style="color:#377BCD">Text here</p> · <div style="background-color:#377BCD">Div content here</div>

Shades of #377BCD

Tints of #377BCD

Tones of #377BCD

Color harmonies

Complementary — #CD8A37:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #377BCD: #000000.

Semi-transparent (opacity) text on #377BCD

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 #377BCD 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 #377BCD 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

← #377BCC  ·  #377BCE →

Frequently asked questions

What color is #377BCD?

#377BCD is Blue, a blue color (RGB 55, 123, 205). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #377BCD?

#377BCD is RGB 55, 123, 205 — HSL 213°, 60%, 51% — CMYK 73%, 40%, 0%, 20%.

What colors go with #377BCD?

Its complement is #CD8A37; analogous partners are #37C6CD and #3F37CD. It also appears in 6+ palettes in our collection.

Can I use #377BCD for text?

Black text on #377BCD has a contrast ratio of 4.88:1 (passes WCAG AA); white text gives 4.31:1.