Palettes / Colors / #307BB0

#307BB0 — Blue

#307BB0 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 #307BB0 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.

#307BB0 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 #B06630; it also sits naturally between #30B0A5 and #303BB0. 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 19% · Green 48% · Blue 69%

Cyan 73% · Magenta 30% · Yellow 0% · Key 31%

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

Previews

CSS code for #307BB0

.text { color: #307BB0; }
.background { background-color: #307BB0; }
.border { border: 3px solid #307BB0; }
.text-rgb { color: rgb(48, 123, 176); }
.text-hsl { color: hsl(205, 57%, 44%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #307BB0; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(48, 123, 176, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #307BB0; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(48, 123, 176, 0.8); }

HTML: <p style="color:#307BB0">Text here</p> · <div style="background-color:#307BB0">Div content here</div>

Shades of #307BB0

Tints of #307BB0

Tones of #307BB0

Color harmonies

Complementary — #B06630:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #307BB0: #000000.

Semi-transparent (opacity) text on #307BB0

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 #307BB0 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 #307BB0 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

← #307BAF  ·  #307BB1 →

Frequently asked questions

What color is #307BB0?

#307BB0 is Blue, a blue color (RGB 48, 123, 176). Its closest standard named color is SteelBlue.

What is the RGB and HSL of #307BB0?

#307BB0 is RGB 48, 123, 176 — HSL 205°, 57%, 44% — CMYK 73%, 30%, 0%, 31%.

What colors go with #307BB0?

Its complement is #B06630; analogous partners are #30B0A5 and #303BB0. It also appears in 6+ palettes in our collection.

Can I use #307BB0 for text?

Black text on #307BB0 has a contrast ratio of 4.59:1 (passes WCAG AA); white text gives 4.58:1.