CSS utility

Indigo CSS Utilities

Indigo CSS utilities provide reusable variables and utility classes for #4B0082. 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 #4B0082 WCAG

Preview Indigo #4B0082

Utility Classes

Background.bg-indigo

Text.text-indigo

Border.border-indigo

Surface.surface-indigo

CSS Snippet

:root {
  --color-indigo: #4B0082;
  --color-indigo-rgb: 75 0 130;
  --color-indigo-contrast: #FFFFFF;
}

.bg-indigo { background-color: var(--color-indigo); }
.text-indigo { color: var(--color-indigo); }
.border-indigo { border-color: var(--color-indigo); }
.surface-indigo {
  background-color: var(--color-indigo);
  color: var(--color-indigo-contrast);
  border: 1px solid color-mix(in srgb, var(--color-indigo), #111827 18%);
}
.shadow-indigo { box-shadow: 0 18px 40px rgb(var(--color-indigo-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 contrast1.62:1

White contrast12.95:1

RGB token75 0 130

Luminance0.0311

Black text1.62:1AA Fail

White text12.95:1AA 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-indigo: #4B0082;",
  "rgb": "--color-indigo-rgb: 75 0 130;",
  "contrast": "--color-indigo-contrast: #FFFFFF;"
}

Utility classes

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

Accessibility

{
  "bestTextColor": "#FFFFFF",
  "contrast": {
    "black": 1.62,
    "white": 12.95
  },
  "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-indigo: #4B0082;\n  --color-indigo-rgb: 75 0 130;\n  --color-indigo-contrast: #FFFFFF;\n}\n\n.bg-indigo { background-color: var(--color-indigo); }\n.text-indigo { color: var(--color-indigo); }\n.border-indigo { border-color: var(--color-indigo); }\n.surface-indigo {\n  background-color: var(--color-indigo);\n  color: var(--color-indigo-contrast);\n  border: 1px solid color-mix(in srgb, var(--color-indigo), #111827 18%);\n}\n.shadow-indigo { box-shadow: 0 18px 40px rgb(var(--color-indigo-rgb) / 28%); }"
}

Related endpoints

[
  "https://www.colorsencyclopedia.com/api/css/colors/indigo.json",
  "https://www.colorsencyclopedia.com/api/colors/indigo.json"
]

Full JSON dataset

{
  "datasetVersion": "1.0.0",
  "slug": "indigo",
  "name": "Indigo",
  "hex": "#4B0082",
  "rgb": [
    75,
    0,
    130
  ],
  "hsl": [
    275,
    100,
    25
  ],
  "cmyk": [
    42,
    100,
    0,
    49
  ],
  "luminance": 0.0311,
  "contrast": {
    "black": 1.62,
    "white": 12.95
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "family": "purple",
  "temperature": "cool",
  "tone": [
    "jewel-tone"
  ],
  "bestTextColor": "#FFFFFF",
  "cssVariables": {
    "color": "--color-indigo: #4B0082;",
    "rgb": "--color-indigo-rgb: 75 0 130;",
    "contrast": "--color-indigo-contrast: #FFFFFF;"
  },
  "utilityClasses": {
    "background": ".bg-indigo",
    "text": ".text-indigo",
    "border": ".border-indigo",
    "surface": ".surface-indigo",
    "shadow": ".shadow-indigo"
  },
  "cssSnippet": ":root {\n  --color-indigo: #4B0082;\n  --color-indigo-rgb: 75 0 130;\n  --color-indigo-contrast: #FFFFFF;\n}\n\n.bg-indigo { background-color: var(--color-indigo); }\n.text-indigo { color: var(--color-indigo); }\n.border-indigo { border-color: var(--color-indigo); }\n.surface-indigo {\n  background-color: var(--color-indigo);\n  color: var(--color-indigo-contrast);\n  border: 1px solid color-mix(in srgb, var(--color-indigo), #111827 18%);\n}\n.shadow-indigo { box-shadow: 0 18px 40px rgb(var(--color-indigo-rgb) / 28%); }",
  "useCases": [
    "CSS variables",
    "utility classes",
    "design system tokens",
    "UI surface styling",
    "accessible text pairing"
  ],
  "relatedEndpoints": [
    "https://www.colorsencyclopedia.com/api/css/colors/indigo.json",
    "https://www.colorsencyclopedia.com/api/colors/indigo.json"
  ],
  "url": "https://www.colorsencyclopedia.com/css/colors/indigo/",
  "colorUrl": "https://www.colorsencyclopedia.com/colors/indigo/",
  "hexUrl": "https://www.colorsencyclopedia.com/hex/4b0082/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/css/colors/indigo.json"
}

Indigo CSS Utilities

Utility Classes

CSS Snippet

Usage Examples

Implementation Notes

Machine-Readable Indigo CSS Utilities (JSON)

Related CSS Color Guides