CSS utility

Mustard CSS Utilities

Mustard CSS utilities for #FFDB58: copy variables and classes for backgrounds, text, borders and surfaces, with RGB tokens and contrast guidance.

Color page #FFDB58 WCAG

Preview Mustard #FFDB58

Utility Classes

Background.bg-mustard

Text.text-mustard

Border.border-mustard

Surface.surface-mustard

CSS Snippet

:root {
  --color-mustard: #FFDB58;
  --color-mustard-rgb: 255 219 88;
  --color-mustard-contrast: #111827;
}

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

Usage Examples

Surface cardMustard uses #111827 as its stronger standard foreground at 15.53:1.

Border accentUse #FFDB58 as a warm yellow outline, divider, or interface accent.

Text accentPlace #FFDB58 on a checked contrasting surface before using it for text, links, or icons.

Implementation Notes

Best text color#111827

Black contrast15.53:1

White contrast1.35:1

RGB token255 219 88

Luminance0.7263

Black text15.53:1AA Pass

White text1.35:1AA Fail

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-mustard: #FFDB58;",
  "rgb": "--color-mustard-rgb: 255 219 88;",
  "contrast": "--color-mustard-contrast: #111827;"
}

Utility classes

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

Accessibility

{
  "bestTextColor": "#111827",
  "contrast": {
    "black": 15.53,
    "white": 1.35
  },
  "wcag": {
    "AA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ],
    "AAA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ]
  }
}

Implementation

{
  "useCases": [
    "CSS variables",
    "utility classes",
    "design system tokens",
    "UI surface styling",
    "accessible text pairing"
  ],
  "cssSnippet": ":root {\n  --color-mustard: #FFDB58;\n  --color-mustard-rgb: 255 219 88;\n  --color-mustard-contrast: #111827;\n}\n\n.bg-mustard { background-color: var(--color-mustard); }\n.text-mustard { color: var(--color-mustard); }\n.border-mustard { border-color: var(--color-mustard); }\n.surface-mustard {\n  background-color: var(--color-mustard);\n  color: var(--color-mustard-contrast);\n  border: 1px solid color-mix(in srgb, var(--color-mustard), #111827 18%);\n}\n.shadow-mustard { box-shadow: 0 18px 40px rgb(var(--color-mustard-rgb) / 28%); }"
}

Related endpoints

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

Full JSON dataset

{
  "datasetVersion": "1.0.0",
  "slug": "mustard",
  "name": "Mustard",
  "hex": "#FFDB58",
  "rgb": [
    255,
    219,
    88
  ],
  "hsl": [
    47,
    100,
    67
  ],
  "cmyk": [
    0,
    14,
    65,
    0
  ],
  "luminance": 0.7263,
  "contrast": {
    "black": 15.53,
    "white": 1.35
  },
  "wcag": {
    "AA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ],
    "AAA": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ]
  },
  "family": "yellow",
  "temperature": "warm",
  "tone": [
    "vibrant"
  ],
  "bestTextColor": "#111827",
  "cssVariables": {
    "color": "--color-mustard: #FFDB58;",
    "rgb": "--color-mustard-rgb: 255 219 88;",
    "contrast": "--color-mustard-contrast: #111827;"
  },
  "utilityClasses": {
    "background": ".bg-mustard",
    "text": ".text-mustard",
    "border": ".border-mustard",
    "surface": ".surface-mustard",
    "shadow": ".shadow-mustard"
  },
  "cssSnippet": ":root {\n  --color-mustard: #FFDB58;\n  --color-mustard-rgb: 255 219 88;\n  --color-mustard-contrast: #111827;\n}\n\n.bg-mustard { background-color: var(--color-mustard); }\n.text-mustard { color: var(--color-mustard); }\n.border-mustard { border-color: var(--color-mustard); }\n.surface-mustard {\n  background-color: var(--color-mustard);\n  color: var(--color-mustard-contrast);\n  border: 1px solid color-mix(in srgb, var(--color-mustard), #111827 18%);\n}\n.shadow-mustard { box-shadow: 0 18px 40px rgb(var(--color-mustard-rgb) / 28%); }",
  "useCases": [
    "CSS variables",
    "utility classes",
    "design system tokens",
    "UI surface styling",
    "accessible text pairing"
  ],
  "relatedEndpoints": [
    "https://www.colorsencyclopedia.com/api/css/colors/mustard.json",
    "https://www.colorsencyclopedia.com/api/colors/mustard.json"
  ],
  "url": "https://www.colorsencyclopedia.com/css/colors/mustard/",
  "colorUrl": "https://www.colorsencyclopedia.com/colors/mustard/",
  "hexUrl": "https://www.colorsencyclopedia.com/hex/ffdb58/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/css/colors/mustard.json"
}

Mustard CSS Utilities

Utility Classes

CSS Snippet

Usage Examples

Implementation Notes

Machine-Readable Mustard CSS Utilities (JSON)

Related CSS Color Guides