Palettes / Colors / #355FBB

#355FBB — Blue

#355FBB is a blue color we call Blue, closest to the named color SteelBlue (#4682B4). It belongs to the blue family.

Color name

Closest CSS keyword: steelblue (#4682B4) — not an exact match. CSS steelblue gives you #4682B4, a different color; use #355FBB 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.

#355FBB 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 #BB9035; it also sits naturally between #35A2BB and #4D35BB. 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 21% · Green 37% · Blue 73%

Cyan 72% · Magenta 49% · Yellow 0% · Key 27%

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

Previews

CSS code for #355FBB

.text { color: #355FBB; }
.background { background-color: #355FBB; }
.border { border: 3px solid #355FBB; }
.text-rgb { color: rgb(53, 95, 187); }
.text-hsl { color: hsl(221, 56%, 47%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #355FBB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(53, 95, 187, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #355FBB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(53, 95, 187, 0.8); }

HTML: <p style="color:#355FBB">Text here</p> · <div style="background-color:#355FBB">Div content here</div>

Shades of #355FBB

Tints of #355FBB

Tones of #355FBB

Color harmonies

Complementary — #BB9035:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #355FBB: #FFFFFF.

Semi-transparent (opacity) text on #355FBB

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 #355FBB 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 #355FBB 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

← #355FBA  ·  #355FBC →

Frequently asked questions

What color is #355FBB?

#355FBB is Blue, a blue color (RGB 53, 95, 187). Its closest standard named color is SteelBlue.

What is the RGB and HSL of #355FBB?

#355FBB is RGB 53, 95, 187 — HSL 221°, 56%, 47% — CMYK 72%, 49%, 0%, 27%.

What colors go with #355FBB?

Its complement is #BB9035; analogous partners are #35A2BB and #4D35BB. It also appears in 6+ palettes in our collection.

Can I use #355FBB for text?

White text on #355FBB has a contrast ratio of 5.99:1 (passes WCAG AA); black text gives 3.51:1.