#3A3E42
Approximate Color Name: Charcoal
Closest CSS Color Name: DarkSlateGray (#2F4F4F)
Color Space Coordinates
Copyable codes for development, CSS styling, and print
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)
Tonal Variations (Shades, Tints & Tones)
Calibrated step variations created by adding black (shades), white (tints), and gray (tones)
Harmonies for #3A3E42 (Charcoal)
Classical color wheel pairings calculated from 360-degree rotational angles
Practical UI/UX Design Usage for #3A3E42
Primary Buttons & Focus Rings
With an RGB luminance of 58, 62, 66, this shade works excellently with white text (#FFFFFF) for call-to-action buttons and form focus states.
Background Containers
To use #3A3E42 as a card background or subtle surface tint, apply an opacity of 5% to 15% (bg-[#3A3E42]/10 in Tailwind) to maintain high typography readability.
Data Visualization & Badges
Pair with its complementary accent #413D3A or triadic partner #413A3D to distinguish distinct categories in charts and tables.
Explore More Popular Colors
View All Colors Directory →Tools & Utilities for #3A3E42
Explore gradients, test contrast ratios, and generate monochromatic shades with #3A3E42
Related Educational Guides
Learn how color models, web contrast standards, and conversion mathematics work
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.
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.
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.