Dark Color

#221B2E

Approximate Color Name: Midnight Obsidian

Closest CSS Color Name: DarkSlateGray (#2F4F4F)

Color Space Coordinates

Copyable codes for development, CSS styling, and print

HEX#221B2E
RGBrgb(34, 27, 46)
HSLhsl(262, 26%, 14%)
HSV / HSBhsv(262, 41.3%, 18%)
CMYK (Print)cmyk(26%, 41%, 0%, 82%)
OKLCH (CSS4)oklch(0.24 0.037 300.7)
OKLaboklab(0.24 0.019 -0.032)
Tailwind CSSbg-[#221B2E]
Check WCAG ContrastGenerate Shades & TintsBuild Palette

WCAG 2.1 Contrast & Accessibility Audit

Evaluates readability standards for normal body text (4.5:1 AA / 7.0:1 AAA) and large headings (3.0:1 AA / 4.5:1 AAA)

Against Pure White (#FFFFFF)16.61:1
White Text on #221B2E
AA Normal Text
AAA Normal Text
Against Pure Black (#000000)1.26:1
Black Text on #221B2E
AA Normal Text
AAA Normal Text

Tonal Variations (Shades, Tints & Tones)

Calibrated step variations created by adding black (shades), white (tints), and gray (tones)

Shades (Darker with Black)
#221B2E
#1F1829
#1B1625
#181320
#14101C
#110E17
#0E0B12
#0A080E
#070509
#030305
#000000
Tints (Lighter with White)
#221B2E
#383243
#4E4958
#645F6D
#7A7682
#918D97
#A7A4AB
#BDBBC0
#D3D1D5
#E9E8EA
#FFFFFF
Tones (Muted with Gray)
#221B2E
#2B2536
#352F3E
#3E3947
#48434F
#514E57
#5A585F
#646267
#6D6C70
#777678
#808080

Harmonies for #221B2E (Midnight Obsidian)

Classical color wheel pairings calculated from 360-degree rotational angles

Complementary (180°)

Opposite
#221B2E#262D1A

Triadic (120° / 240°)

Equidistant
#221B2E#2D211A#1A2D21

Analogous (±30°)

Adjacent
#1A1D2D#221B2E#2B1A2D

Split-Complementary (150° / 210°)

Soft Contrast
#221B2E#2D2B1A#1D2D1A

Practical UI/UX Design Usage for #221B2E

Primary Buttons & Focus Rings

With an RGB luminance of 34, 27, 46, this shade works excellently with white text (#FFFFFF) for call-to-action buttons and form focus states.

Background Containers

To use #221B2E as a card background or subtle surface tint, apply an opacity of 5% to 15% (bg-[#221B2E]/10 in Tailwind) to maintain high typography readability.

Data Visualization & Badges

Pair with its complementary accent #262D1A or triadic partner #2D211A to distinguish distinct categories in charts and tables.

Explore More Popular Colors

View All Colors Directory →
Light
#FF5733
Persimmon Red255,87,51
Explore Color Details
Dark
#3B82F6
Bright Blue59,130,246
Explore Color Details
Light
#10B981
Emerald Green16,185,129
Explore Color Details
Light
#F59E0B
Amber Glow245,158,11
Explore Color Details
Dark
#8B5CF6
Vivid Purple139,92,246
Explore Color Details
Light
#EC4899
Pink Rose236,72,153
Explore Color Details

Tools & Utilities for #221B2E

Explore gradients, test contrast ratios, and generate monochromatic shades with #221B2E

All Tools →

Contrast Checker

Verify WCAG 2.1 AA/AAA compliance on #221B2E surfaces.

Shades & Tints Scale

Generate 10-step tints and dark shade ramp tokens.

Gradient Generator

Build CSS linear and radial gradients starting with #221B2E.

Palette Generator

Lock #221B2E and generate complementary 5-color palettes.

Related Educational Guides

Learn how color models, web contrast standards, and conversion mathematics work

All Guides →
Color Fundamentals

What is a HEX Color Code? Complete Hexadecimal Color Guide

Understand how 6-digit (#RRGGBB), 3-digit (#RGB), and 8-digit (#RRGGBBAA) hexadecimal color codes work, from base-16 mathematics to browser rendering.

6 min readRead →
Web Development

HEX vs RGB Color Formats: Differences, Math & When to Use Which

A deep technical comparison between HEX and RGB/RGBA color models in web development, CSS stylesheets, design systems, and rendering engines.

7 min readRead →
Color Fundamentals

RGB vs CMYK: Additive Screen Light vs Subtractive Print Ink

Learn why digital colors look different when printed. Explore the physics of additive RGB light versus subtractive CMYK ink and how to avoid gamut clipping.

8 min readRead →