Palettes / Colors / #21BBFF

#21BBFF — Vivid Blue

#21BBFF is a blue color we call Vivid Blue, closest to the named color DeepSkyBlue (#00BFFF). It belongs to the blue family.

Color name

Closest CSS keyword: deepskyblue (#00BFFF) — not an exact match. CSS deepskyblue gives you #00BFFF, a different color; use #21BBFF 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.

#21BBFF 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 #FF621F; it also sits naturally between #1FFFD2 and #1F4BFF. In the palettes below you can see it working alongside real color combinations from our collection.

Copy HEX Copy RGB Copy HSL Download PNG swatch SVG

Color values

RGB & CMYK percentages

Red 13% · Green 73% · Blue 100%

Cyan 87% · Magenta 27% · Yellow 0% · Key 0%

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

Previews

CSS code for #21BBFF

.text { color: #21BBFF; }
.background { background-color: #21BBFF; }
.border { border: 3px solid #21BBFF; }
.text-rgb { color: rgb(33, 187, 255); }
.text-hsl { color: hsl(198, 100%, 56%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #21BBFF; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(33, 187, 255, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #21BBFF; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(33, 187, 255, 0.8); }

HTML: <p style="color:#21BBFF">Text here</p> · <div style="background-color:#21BBFF">Div content here</div>

Shades of #21BBFF

Tints of #21BBFF

Tones of #21BBFF

Color harmonies

Complementary — #FF621F:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #21BBFF: #000000.

Semi-transparent (opacity) text on #21BBFF

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 #21BBFF 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 #21BBFF 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

← #21BBFE  ·  #21BC00 →

Frequently asked questions

What color is #21BBFF?

#21BBFF is Vivid Blue, a blue color (RGB 33, 187, 255). Its closest standard named color is DeepSkyBlue.

What is the RGB and HSL of #21BBFF?

#21BBFF is RGB 33, 187, 255 — HSL 198°, 100%, 56% — CMYK 87%, 27%, 0%, 0%.

What colors go with #21BBFF?

Its complement is #FF621F; analogous partners are #1FFFD2 and #1F4BFF. It also appears in 6+ palettes in our collection.

Can I use #21BBFF for text?

Black text on #21BBFF has a contrast ratio of 9.62:1 (passes WCAG AA); white text gives 2.18:1.