Palettes / Colors / #2121BB

#2121BB — Blue

#2121BB is a blue color we call Blue, closest to the named color DarkBlue (#00008B). It belongs to the blue family.

Color name

Closest CSS keyword: darkblue (#00008B) — not an exact match. CSS darkblue gives you #00008B, a different color; use #2121BB 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.

#2121BB 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 #BABA21; it also sits naturally between #216EBA and #6E21BA. 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 13% · Blue 73%

Cyan 82% · Magenta 82% · Yellow 0% · Key 27%

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

Previews

CSS code for #2121BB

.text { color: #2121BB; }
.background { background-color: #2121BB; }
.border { border: 3px solid #2121BB; }
.text-rgb { color: rgb(33, 33, 187); }
.text-hsl { color: hsl(240, 70%, 43%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #2121BB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(33, 33, 187, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #2121BB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(33, 33, 187, 0.8); }

HTML: <p style="color:#2121BB">Text here</p> · <div style="background-color:#2121BB">Div content here</div>

Shades of #2121BB

Tints of #2121BB

Tones of #2121BB

Color harmonies

Complementary — #BABA21:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #2121BB: #FFFFFF.

Semi-transparent (opacity) text on #2121BB

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 #2121BB 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 #2121BB 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

← #2121BA  ·  #2121BC →

Frequently asked questions

What color is #2121BB?

#2121BB is Blue, a blue color (RGB 33, 33, 187). Its closest standard named color is DarkBlue.

What is the RGB and HSL of #2121BB?

#2121BB is RGB 33, 33, 187 — HSL 240°, 70%, 43% — CMYK 82%, 82%, 0%, 27%.

What colors go with #2121BB?

Its complement is #BABA21; analogous partners are #216EBA and #6E21BA. It also appears in 6+ palettes in our collection.

Can I use #2121BB for text?

White text on #2121BB has a contrast ratio of 10.50:1 (passes WCAG AA); black text gives 2.00:1.