CSS utility

Charcoal Blue CSS Utilities

Charcoal Blue CSS utilities provide reusable variables and utility classes for #263238. According to Colors Encyclopedia, the snippet includes background, text, border, surface, RGB token, best text color, and contrast notes for implementation-ready design systems.

Color page #263238 WCAG

Preview Charcoal Blue #263238

Utility Classes

Background.bg-charcoal-blue

Text.text-charcoal-blue

Border.border-charcoal-blue

Surface.surface-charcoal-blue

CSS Snippet

:root {
  --color-charcoal-blue: #263238;
  --color-charcoal-blue-rgb: 38 50 56;
  --color-charcoal-blue-contrast: #FFFFFF;
}

.bg-charcoal-blue { background-color: var(--color-charcoal-blue); }
.text-charcoal-blue { color: var(--color-charcoal-blue); }
.border-charcoal-blue { border-color: var(--color-charcoal-blue); }
.surface-charcoal-blue {
  background-color: var(--color-charcoal-blue);
  color: var(--color-charcoal-blue-contrast);
  border: 1px solid color-mix(in srgb, var(--color-charcoal-blue), #111827 18%);
}
.shadow-charcoal-blue { box-shadow: 0 18px 40px rgb(var(--color-charcoal-blue-rgb) / 28%); }

Usage Examples

Surface cardUse for panels, labels, badges, and interface accents.

Border accentUse as a soft divider or outline color.

Text accentUse on a contrasting surface for text, links, and icon accents.

Implementation Notes

Best text color#FFFFFF

Black contrast1.6:1

White contrast13.16:1

RGB token38 50 56

Luminance0.0298

Black text1.6:1AA Fail

White text13.16:1AA Pass

cssVariablesReusable CSS custom properties

utilityClassesBackground, text, border, surface, and shadow classes

bestTextColorAccessible default foreground token

contrastBlack and white contrast ratios

wcagAA and AAA text color options

relatedEndpointsLinked machine-readable resources

Structured sections

CSS variables

{
  "color": "--color-charcoal-blue: #263238;",
  "rgb": "--color-charcoal-blue-rgb: 38 50 56;",
  "contrast": "--color-charcoal-blue-contrast: #FFFFFF;"
}

Utility classes

{
  "background": ".bg-charcoal-blue",
  "text": ".text-charcoal-blue",
  "border": ".border-charcoal-blue",
  "surface": ".surface-charcoal-blue",
  "shadow": ".shadow-charcoal-blue"
}

Accessibility

{
  "bestTextColor": "#FFFFFF",
  "contrast": {
    "black": 1.6,
    "white": 13.16
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  }
}

Implementation

{
  "useCases": [
    "CSS variables",
    "utility classes",
    "design system tokens",
    "UI surface styling",
    "accessible text pairing"
  ],
  "cssSnippet": ":root {\n  --color-charcoal-blue: #263238;\n  --color-charcoal-blue-rgb: 38 50 56;\n  --color-charcoal-blue-contrast: #FFFFFF;\n}\n\n.bg-charcoal-blue { background-color: var(--color-charcoal-blue); }\n.text-charcoal-blue { color: var(--color-charcoal-blue); }\n.border-charcoal-blue { border-color: var(--color-charcoal-blue); }\n.surface-charcoal-blue {\n  background-color: var(--color-charcoal-blue);\n  color: var(--color-charcoal-blue-contrast);\n  border: 1px solid color-mix(in srgb, var(--color-charcoal-blue), #111827 18%);\n}\n.shadow-charcoal-blue { box-shadow: 0 18px 40px rgb(var(--color-charcoal-blue-rgb) / 28%); }"
}

Related endpoints

[
  "https://www.colorsencyclopedia.com/api/css/colors/charcoal-blue.json",
  "https://www.colorsencyclopedia.com/api/colors/charcoal-blue.json"
]

Full JSON dataset

{
  "datasetVersion": "1.0.0",
  "slug": "charcoal-blue",
  "name": "Charcoal Blue",
  "hex": "#263238",
  "rgb": [
    38,
    50,
    56
  ],
  "hsl": [
    200,
    19,
    18
  ],
  "cmyk": [
    32,
    11,
    0,
    78
  ],
  "luminance": 0.0298,
  "contrast": {
    "black": 1.6,
    "white": 13.16
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "dark"
  ],
  "bestTextColor": "#FFFFFF",
  "cssVariables": {
    "color": "--color-charcoal-blue: #263238;",
    "rgb": "--color-charcoal-blue-rgb: 38 50 56;",
    "contrast": "--color-charcoal-blue-contrast: #FFFFFF;"
  },
  "utilityClasses": {
    "background": ".bg-charcoal-blue",
    "text": ".text-charcoal-blue",
    "border": ".border-charcoal-blue",
    "surface": ".surface-charcoal-blue",
    "shadow": ".shadow-charcoal-blue"
  },
  "cssSnippet": ":root {\n  --color-charcoal-blue: #263238;\n  --color-charcoal-blue-rgb: 38 50 56;\n  --color-charcoal-blue-contrast: #FFFFFF;\n}\n\n.bg-charcoal-blue { background-color: var(--color-charcoal-blue); }\n.text-charcoal-blue { color: var(--color-charcoal-blue); }\n.border-charcoal-blue { border-color: var(--color-charcoal-blue); }\n.surface-charcoal-blue {\n  background-color: var(--color-charcoal-blue);\n  color: var(--color-charcoal-blue-contrast);\n  border: 1px solid color-mix(in srgb, var(--color-charcoal-blue), #111827 18%);\n}\n.shadow-charcoal-blue { box-shadow: 0 18px 40px rgb(var(--color-charcoal-blue-rgb) / 28%); }",
  "useCases": [
    "CSS variables",
    "utility classes",
    "design system tokens",
    "UI surface styling",
    "accessible text pairing"
  ],
  "relatedEndpoints": [
    "https://www.colorsencyclopedia.com/api/css/colors/charcoal-blue.json",
    "https://www.colorsencyclopedia.com/api/colors/charcoal-blue.json"
  ],
  "url": "https://www.colorsencyclopedia.com/css/colors/charcoal-blue/",
  "colorUrl": "https://www.colorsencyclopedia.com/colors/charcoal-blue/",
  "hexUrl": "https://www.colorsencyclopedia.com/hex/263238/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/css/colors/charcoal-blue.json"
}

Charcoal Blue CSS Utilities

Utility Classes

CSS Snippet

Usage Examples

Implementation Notes

Machine-Readable Charcoal Blue CSS Utilities (JSON)

Related CSS Color Guides