Palettes / Colors / #166CD4

#166CD4 — Vivid Blue

#166CD4 is a blue color we call Vivid 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 #166CD4 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.

#166CD4 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 #D47F16; it also sits naturally between #16CBD4 and #2016D4. 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 9% · Green 42% · Blue 83%

Cyan 90% · Magenta 49% · Yellow 0% · Key 17%

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

Previews

CSS code for #166CD4

.text { color: #166CD4; }
.background { background-color: #166CD4; }
.border { border: 3px solid #166CD4; }
.text-rgb { color: rgb(22, 108, 212); }
.text-hsl { color: hsl(213, 81%, 46%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #166CD4; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(22, 108, 212, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #166CD4; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(22, 108, 212, 0.8); }

HTML: <p style="color:#166CD4">Text here</p> · <div style="background-color:#166CD4">Div content here</div>

Shades of #166CD4

Tints of #166CD4

Tones of #166CD4

Color harmonies

Complementary — #D47F16:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #166CD4: #FFFFFF.

Semi-transparent (opacity) text on #166CD4

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 #166CD4 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 #166CD4 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

← #166CD3  ·  #166CD5 →

Frequently asked questions

What color is #166CD4?

#166CD4 is Vivid Blue, a blue color (RGB 22, 108, 212). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #166CD4?

#166CD4 is RGB 22, 108, 212 — HSL 213°, 81%, 46% — CMYK 90%, 49%, 0%, 17%.

What colors go with #166CD4?

Its complement is #D47F16; analogous partners are #16CBD4 and #2016D4. It also appears in 6+ palettes in our collection.

Can I use #166CD4 for text?

White text on #166CD4 has a contrast ratio of 5.08:1 (passes WCAG AA); black text gives 4.13:1.