#155E75 color
The swatch above shows #155E75 with its hex code written on it in white and in black, so you can see which of the two is legible before reading the measured ratios below.
#155E75 is a dark, vivid blue, closest to the CSS named color darkslategray (#2F4F4F).
It is also a Tailwind CSS default: cyan-800. That means you can write bg-cyan-800 or text-cyan-800 directly, with no arbitrary-value brackets and no entry in your theme config.
Color values
| HEX | #155E75 |
| RGB | rgb(21, 94, 117) |
| HSL | hsl(194, 70%, 27%) |
| CMYK | cmyk(82%, 20%, 0%, 54%) |
| Decimal | 1400437 |
| CSS | color: #155E75; |
| Android | 0xFF155E75 |
| Swift | UIColor(red: 0.082, green: 0.369, blue: 0.459, alpha: 1) |
Accessibility and contrast
| White text on #155E75 | 7.27:1 — AA pass · AA large pass · AAA pass |
| Black text on #155E75 | 2.89:1 — AA fail · AA large fail · AAA fail |
| Recommended text color | white |
WCAG 2.1 asks for at least 4.5:1 for body text and 3:1 for large text (18 pt, or 14 pt bold).
Tints and shades of #155E75
Each swatch keeps the hue and saturation of #155E75 and varies only lightness — the quickest way to build a usable scale from a single brand color.
Colors that go with #155E75
Harmonies generated by rotating the hue on the color wheel while holding saturation and lightness constant.
Using #155E75 in code
/* CSS */
.element { color: #155E75; background-color: #155E75; }
.element { color: rgb(21 94 117); }
.element { color: hsl(194 70% 27%); }
/* Tailwind */
<div class="bg-cyan-800 text-white">
/* SCSS variable */
$brand: #155E75;Frequently asked questions
What color is #155E75?
#155E75 is a dark, vivid blue. Its hue sits at 194° on the color wheel, with 70% saturation and 27% lightness.
What is #155E75 in RGB?
#155E75 converts to rgb(21, 94, 117) — 21 red, 94 green and 117 blue.
What is #155E75 in CMYK?
Approximately cmyk(82%, 20%, 0%, 54%). Print output depends on the ICC profile of the press and paper, so treat this as a starting point rather than an exact match.
Should text on #155E75 be white or black?
White gives the better contrast ratio (7.27:1 versus 2.89:1).
What is the complementary color of #155E75?
#752B15 — the hue directly opposite #155E75 on the color wheel.