Palettes / Colors / #166DCC

#166DCC — Vivid Blue

#166DCC 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 #166DCC 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.

#166DCC 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 #CB7315; it also sits naturally between #15C8CB and #1815CB. 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 43% · Blue 80%

Cyan 89% · Magenta 47% · Yellow 0% · Key 20%

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

Previews

CSS code for #166DCC

.text { color: #166DCC; }
.background { background-color: #166DCC; }
.border { border: 3px solid #166DCC; }
.text-rgb { color: rgb(22, 109, 204); }
.text-hsl { color: hsl(211, 81%, 44%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #166DCC; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(22, 109, 204, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #166DCC; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(22, 109, 204, 0.8); }

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

Shades of #166DCC

Tints of #166DCC

Tones of #166DCC

Color harmonies

Complementary — #CB7315:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #166DCC: #FFFFFF.

Semi-transparent (opacity) text on #166DCC

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 #166DCC 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 #166DCC 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

← #166DCB  ·  #166DCD →

Frequently asked questions

What color is #166DCC?

#166DCC is Vivid Blue, a blue color (RGB 22, 109, 204). Its closest standard named color is RoyalBlue.

What is the RGB and HSL of #166DCC?

#166DCC is RGB 22, 109, 204 — HSL 211°, 81%, 44% — CMYK 89%, 47%, 0%, 20%.

What colors go with #166DCC?

Its complement is #CB7315; analogous partners are #15C8CB and #1815CB. It also appears in 6+ palettes in our collection.

Can I use #166DCC for text?

White text on #166DCC has a contrast ratio of 5.13:1 (passes WCAG AA); black text gives 4.09:1.