Palettes / Colors / #21BBFB

#21BBFB — Vivid Blue

#21BBFB 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 #21BBFB 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.

#21BBFB 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 #FB6423; it also sits naturally between #23FBCF and #234EFB. 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 13% · Green 73% · Blue 98%

Cyan 87% · Magenta 25% · Yellow 0% · Key 2%

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

Previews

CSS code for #21BBFB

.text { color: #21BBFB; }
.background { background-color: #21BBFB; }
.border { border: 3px solid #21BBFB; }
.text-rgb { color: rgb(33, 187, 251); }
.text-hsl { color: hsl(198, 96%, 56%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #21BBFB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(33, 187, 251, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #21BBFB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(33, 187, 251, 0.8); }

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

Shades of #21BBFB

Tints of #21BBFB

Tones of #21BBFB

Color harmonies

Complementary — #FB6423:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #21BBFB: #000000.

Semi-transparent (opacity) text on #21BBFB

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 #21BBFB 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 #21BBFB 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

← #21BBFA  ·  #21BBFC →

Frequently asked questions

What color is #21BBFB?

#21BBFB is Vivid Blue, a blue color (RGB 33, 187, 251). Its closest standard named color is DeepSkyBlue.

What is the RGB and HSL of #21BBFB?

#21BBFB is RGB 33, 187, 251 — HSL 198°, 96%, 56% — CMYK 87%, 25%, 0%, 2%.

What colors go with #21BBFB?

Its complement is #FB6423; analogous partners are #23FBCF and #234EFB. It also appears in 6+ palettes in our collection.

Can I use #21BBFB for text?

Black text on #21BBFB has a contrast ratio of 9.57:1 (passes WCAG AA); white text gives 2.20:1.