Phoenix

Theming

Theming lets you customize your app’s look by adjusting colors, fonts, and styles to match your brand or preferences.

Overview

<p class="mb-3">Phoenix Tailwind uses <a href="https://hbui.dev/" target="_blank">Hummingbird,</a> a modern component system built on <a href="https://tailwindcss.com/" target="_blank">Tailwind CSS v4,</a> designed to make theming clean, scalable, and extremely flexible.
  Phoenix Tailwind provides a set of theme variables (design tokens) that control the visual foundation of the UI - including colors, typography, shadows, and more.</p>
<ul class="space-y-2">
  <li>Theme variables such as <code>--color-primary </code>or <code>--shadow-md </code>are integrated directly into Tailwind utilities. That means you can style components using familiar classes like: <code>bg-primary, text-primary, shadow-md</code> etc., and they will automatically use the values defined in your theme.</li>
  <li>To override the default theme globally, simply redefine variables inside the <code>@theme { ... } </code>block in <code>src/css/theme.css</code> after importing Hummingbird UI styles.</li>
  <li>Multiple themes (e.g., light, dark, or custom variants) can be created by overriding the same variables within a scoped theme selector such as <code>@variant dark { ... } </code>or <code>[data-hb-theme="dark"] { ... }.</code></li>
  <li>A Reboot layer is provided in <code>src/css/reboot.css</code>, a base CSS reset layer that applies consistent element styling across browsers, ensuring a clean and uniform design baseline.</li>
</ul>

Phoenix Tailwind uses Hummingbird, a modern component system built on Tailwind CSS v4, designed to make theming clean, scalable, and extremely flexible. Phoenix Tailwind provides a set of theme variables (design tokens) that control the visual foundation of the UI - including colors, typography, shadows, and more.

Theme variables such as --color-primary or --shadow-md are integrated directly into Tailwind utilities. That means you can style components using familiar classes like: bg-primary, text-primary, shadow-md etc., and they will automatically use the values defined in your theme.
To override the default theme globally, simply redefine variables inside the @theme { ... } block in src/css/theme.css after importing Hummingbird UI styles.
Multiple themes (e.g., light, dark, or custom variants) can be created by overriding the same variables within a scoped theme selector such as @variant dark { ... } or [data-hb-theme="dark"] { ... }.
A Reboot layer is provided in src/css/reboot.css, a base CSS reset layer that applies consistent element styling across browsers, ensuring a clean and uniform design baseline.

Theme variables

<p class="mb-3">Phoenix Tailwind provides a comprehensive set of theme variables covering all aspects of the interface. Updating these variables allows the appearance to be easily customized for different design requirements.</p><pre class="language-css"><code class="lang-css">@theme {
  --color-gray-50: #f5f7fa;
  --color-gray-100: #eff2f6;
  --color-gray-200: #e3e6ed;
  --color-gray-300: #cbd0dd;
  --color-gray-400: #9fa6bc;
  --color-gray-500: #8a94ad;
  --color-gray-600: #6e7891;
  --color-gray-700: #525b75;
  --color-gray-800: #3e465b;
  --color-gray-900: #31374a;
  --color-gray-950: #222834;
  --color-gray-1000: #141824;

  --color-blue-50: #f5f8ff;
  --color-blue-100: #e5edff;
  --color-blue-200: #adc5ff;
  --color-blue-300: #85a9ff;
  --color-blue-400: #6090ff;
  --color-blue-500: #3874ff;
  --color-blue-600: #004dff;
  --color-blue-700: #003cc7;
  --color-blue-800: #0033aa;
  --color-blue-900: #00267b;
  --color-blue-950: #00174d;

  --color-red-50: #ffedeb;
  --color-red-100: #ffe0db;
  --color-red-200: #fabcb3;
  --color-red-300: #f48270;
  --color-red-400: #fb624a;
  --color-red-500: #fa3b1d;
  --color-red-600: #cc1b00;
  --color-red-700: #b81800;
  --color-red-800: #901400;
  --color-red-900: #630d00;
  --color-red-950: #380700;

  --color-green-50: #f0fdec;
  --color-green-100: #d9fbd0;
  --color-green-200: #bee8b4;
  --color-green-300: #90d67f;
  --color-green-400: #51c035;
  --color-green-500: #25b003;
  --color-green-600: #23890b;
  --color-green-700: #1c6c09;
  --color-green-800: #115a00;
  --color-green-900: #0b3d00;
  --color-green-950: #061f00;

  --color-orange-50: #fff6e0;
  --color-orange-100: #ffefca;
  --color-orange-200: #ffe6ad;
  --color-orange-300: #ffcc85;
  --color-orange-400: #ea9c3c;
  --color-orange-500: #e5780b;
  --color-orange-600: #d6630a;
  --color-orange-700: #bc3803;
  --color-orange-800: #901400;
  --color-orange-900: #630d00;
  --color-orange-950: #380700;

  --color-cyan-50: #f0faff;
  --color-cyan-100: #c7ebff;
  --color-cyan-200: #96d9ff;
  --color-cyan-300: #60c6ff;
  --color-cyan-400: #33acef;
  --color-cyan-500: #0097eb;
  --color-cyan-600: #0080c7;
  --color-cyan-700: #005585;
  --color-cyan-800: #004870;
  --color-cyan-900: #003a5b;
  --color-cyan-950: #002337;

  /* Background colors */
  --background-color-soft: var(--color-white);
  --background-color-subtle: var(--color-gray-100);
  --background-color-muted: var(--color-gray-200);
  --background-color-default: var(--color-gray-50);
  --background-color-highlight: var(--color-gray-300);
  --background-color-emphasis: var(--color-gray-400);

  /* Text Colors */
  --text-color-soft: var(--color-gray-500);
  --text-color-subtle: var(--color-gray-700);
  --text-color-muted: var(--color-gray-800);
  --text-color-default: var(--color-gray-900);
  --text-color-highlight: var(--color-gray-950);
  --text-color-emphasis: var(--color-gray-1000);

  --color-light: var(--color-gray-100);
  --color-dark: var(--color-gray-1000);
  --color-contrast: var(--color-white);

  /* primary */
  --color-primary-subtle: var(--color-blue-100);
  --color-primary-lighter: var(--color-blue-200);
  --color-primary-light: var(--color-blue-300);
  --color-primary: var(--color-blue-500);
  --color-primary-dark: var(--color-blue-600);
  --color-primary-darker: var(--color-blue-700);

  /* secondary */
  --color-secondary-subtle: var(--color-gray-100);
  --color-secondary-lighter: var(--color-gray-200);
  --color-secondary-light: var(--color-gray-300);
  --color-secondary: var(--color-gray-900);
  --color-secondary-dark: var(--color-gray-950);
  --color-secondary-darker: var(--color-gray-700);

  /* danger */
  --color-danger-subtle: var(--color-red-100);
  --color-danger-lighter: var(--color-red-200);
  --color-danger-light: var(--color-red-300);
  --color-danger: var(--color-red-500);
  --color-danger-dark: var(--color-red-600);
  --color-danger-darker: var(--color-red-700);

  /* warning */
  --color-warning-subtle: var(--color-orange-100);
  --color-warning-lighter: var(--color-orange-200);
  --color-warning-light: var(--color-orange-300);
  --color-warning: var(--color-orange-500);
  --color-warning-dark: var(--color-orange-600);
  --color-warning-darker: var(--color-orange-700);

  /* success */
  --color-success-subtle: var(--color-green-100);
  --color-success-lighter: var(--color-green-200);
  --color-success-light: var(--color-green-300);
  --color-success: var(--color-green-500);
  --color-success-dark: var(--color-green-600);
  --color-success-darker: var(--color-green-700);

  /* info */
  --color-info-subtle: var(--color-cyan-100);
  --color-info-lighter: var(--color-cyan-200);
  --color-info-light: var(--color-cyan-300);
  --color-info: var(--color-cyan-500);
  --color-info-dark: var(--color-cyan-600);
  --color-info-darker: var(--color-cyan-700);

  /* border colors */
  --border-color-base: var(--color-gray-300);
  --border-color-light: --alpha(var(--border-color-base) / 54%);
  --border-color-primary-subtle: var(--color-blue-300);
  --border-color-secondary-subtle: var(--color-gray-300);
  --border-color-success-subtle: var(--color-green-300);
  --border-color-info-subtle: var(--color-cyan-300);
  --border-color-warning-subtle: var(--color-orange-300);
  --border-color-danger-subtle: var(--color-red-300);
  --border-color-light-subtle: var(--color-gray-100);
  --border-color-dark-subtle: var(--color-gray-500);

  /* line height */
  --leading-base: 1.49;
  --leading-sm: 1.2;
  --leading-lg: 1.4;

  /* font sizes */
  --text-xs: 8.192px;
  --text-xs--line-height: inherit;
  --text-sm: 10.24px;
  --text-sm--line-height: inherit;
  --text-md: 12.8px;
  --text-md--line-height: inherit;
  --text-base: 16px;
  --text-base--line-height: inherit;
  --text-lg: 20px;
  --text-lg--line-height: inherit;
  --text-xl: 25px;
  --text-xl--line-height: inherit;
  --text-2xl: 31.25px;
  --text-2xl--line-height: inherit;
  --text-3xl: 39.063px;
  --text-3xl--line-height: inherit;
  --text-4xl: 48.828px;
  --text-4xl--line-height: inherit;
  --text-5xl: 61.035px;
  --text-5xl--line-height: inherit;
  --text-6xl: 76.294px;
  --text-6xl--line-height: inherit;

  /* shadows */
  --shadow-base: 0 0.5rem 1rem --alpha(var(--color-black) / 15%);
  --shadow-sm: 0 0.125rem 0.25rem --alpha(var(--color-black) / 7.5%);
  --shadow-lg: 0 1rem 3rem --alpha(var(--color-black) / 17.5%);
  --shadow-inset: inset 0 1px 2px --alpha(var(--color-black) / 7.5%);

  /* font family */
  --font-sans: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    Roboto, 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji',
    'Segoe UI Emoji', 'Segoe UI Symbol';

  /* breakpoints */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1540px;
}</code></pre>

Phoenix Tailwind provides a comprehensive set of theme variables covering all aspects of the interface. Updating these variables allows the appearance to be easily customized for different design requirements.

@theme {
  --color-gray-50: #f5f7fa;
  --color-gray-100: #eff2f6;
  --color-gray-200: #e3e6ed;
  --color-gray-300: #cbd0dd;
  --color-gray-400: #9fa6bc;
  --color-gray-500: #8a94ad;
  --color-gray-600: #6e7891;
  --color-gray-700: #525b75;
  --color-gray-800: #3e465b;
  --color-gray-900: #31374a;
  --color-gray-950: #222834;
  --color-gray-1000: #141824;

  --color-blue-50: #f5f8ff;
  --color-blue-100: #e5edff;
  --color-blue-200: #adc5ff;
  --color-blue-300: #85a9ff;
  --color-blue-400: #6090ff;
  --color-blue-500: #3874ff;
  --color-blue-600: #004dff;
  --color-blue-700: #003cc7;
  --color-blue-800: #0033aa;
  --color-blue-900: #00267b;
  --color-blue-950: #00174d;

  --color-red-50: #ffedeb;
  --color-red-100: #ffe0db;
  --color-red-200: #fabcb3;
  --color-red-300: #f48270;
  --color-red-400: #fb624a;
  --color-red-500: #fa3b1d;
  --color-red-600: #cc1b00;
  --color-red-700: #b81800;
  --color-red-800: #901400;
  --color-red-900: #630d00;
  --color-red-950: #380700;

  --color-green-50: #f0fdec;
  --color-green-100: #d9fbd0;
  --color-green-200: #bee8b4;
  --color-green-300: #90d67f;
  --color-green-400: #51c035;
  --color-green-500: #25b003;
  --color-green-600: #23890b;
  --color-green-700: #1c6c09;
  --color-green-800: #115a00;
  --color-green-900: #0b3d00;
  --color-green-950: #061f00;

  --color-orange-50: #fff6e0;
  --color-orange-100: #ffefca;
  --color-orange-200: #ffe6ad;
  --color-orange-300: #ffcc85;
  --color-orange-400: #ea9c3c;
  --color-orange-500: #e5780b;
  --color-orange-600: #d6630a;
  --color-orange-700: #bc3803;
  --color-orange-800: #901400;
  --color-orange-900: #630d00;
  --color-orange-950: #380700;

  --color-cyan-50: #f0faff;
  --color-cyan-100: #c7ebff;
  --color-cyan-200: #96d9ff;
  --color-cyan-300: #60c6ff;
  --color-cyan-400: #33acef;
  --color-cyan-500: #0097eb;
  --color-cyan-600: #0080c7;
  --color-cyan-700: #005585;
  --color-cyan-800: #004870;
  --color-cyan-900: #003a5b;
  --color-cyan-950: #002337;

  /* Background colors */
  --background-color-soft: var(--color-white);
  --background-color-subtle: var(--color-gray-100);
  --background-color-muted: var(--color-gray-200);
  --background-color-default: var(--color-gray-50);
  --background-color-highlight: var(--color-gray-300);
  --background-color-emphasis: var(--color-gray-400);

  /* Text Colors */
  --text-color-soft: var(--color-gray-500);
  --text-color-subtle: var(--color-gray-700);
  --text-color-muted: var(--color-gray-800);
  --text-color-default: var(--color-gray-900);
  --text-color-highlight: var(--color-gray-950);
  --text-color-emphasis: var(--color-gray-1000);

  --color-light: var(--color-gray-100);
  --color-dark: var(--color-gray-1000);
  --color-contrast: var(--color-white);

  /* primary */
  --color-primary-subtle: var(--color-blue-100);
  --color-primary-lighter: var(--color-blue-200);
  --color-primary-light: var(--color-blue-300);
  --color-primary: var(--color-blue-500);
  --color-primary-dark: var(--color-blue-600);
  --color-primary-darker: var(--color-blue-700);

  /* secondary */
  --color-secondary-subtle: var(--color-gray-100);
  --color-secondary-lighter: var(--color-gray-200);
  --color-secondary-light: var(--color-gray-300);
  --color-secondary: var(--color-gray-900);
  --color-secondary-dark: var(--color-gray-950);
  --color-secondary-darker: var(--color-gray-700);

  /* danger */
  --color-danger-subtle: var(--color-red-100);
  --color-danger-lighter: var(--color-red-200);
  --color-danger-light: var(--color-red-300);
  --color-danger: var(--color-red-500);
  --color-danger-dark: var(--color-red-600);
  --color-danger-darker: var(--color-red-700);

  /* warning */
  --color-warning-subtle: var(--color-orange-100);
  --color-warning-lighter: var(--color-orange-200);
  --color-warning-light: var(--color-orange-300);
  --color-warning: var(--color-orange-500);
  --color-warning-dark: var(--color-orange-600);
  --color-warning-darker: var(--color-orange-700);

  /* success */
  --color-success-subtle: var(--color-green-100);
  --color-success-lighter: var(--color-green-200);
  --color-success-light: var(--color-green-300);
  --color-success: var(--color-green-500);
  --color-success-dark: var(--color-green-600);
  --color-success-darker: var(--color-green-700);

  /* info */
  --color-info-subtle: var(--color-cyan-100);
  --color-info-lighter: var(--color-cyan-200);
  --color-info-light: var(--color-cyan-300);
  --color-info: var(--color-cyan-500);
  --color-info-dark: var(--color-cyan-600);
  --color-info-darker: var(--color-cyan-700);

  /* border colors */
  --border-color-base: var(--color-gray-300);
  --border-color-light: --alpha(var(--border-color-base) / 54%);
  --border-color-primary-subtle: var(--color-blue-300);
  --border-color-secondary-subtle: var(--color-gray-300);
  --border-color-success-subtle: var(--color-green-300);
  --border-color-info-subtle: var(--color-cyan-300);
  --border-color-warning-subtle: var(--color-orange-300);
  --border-color-danger-subtle: var(--color-red-300);
  --border-color-light-subtle: var(--color-gray-100);
  --border-color-dark-subtle: var(--color-gray-500);

  /* line height */
  --leading-base: 1.49;
  --leading-sm: 1.2;
  --leading-lg: 1.4;

  /* font sizes */
  --text-xs: 8.192px;
  --text-xs--line-height: inherit;
  --text-sm: 10.24px;
  --text-sm--line-height: inherit;
  --text-md: 12.8px;
  --text-md--line-height: inherit;
  --text-base: 16px;
  --text-base--line-height: inherit;
  --text-lg: 20px;
  --text-lg--line-height: inherit;
  --text-xl: 25px;
  --text-xl--line-height: inherit;
  --text-2xl: 31.25px;
  --text-2xl--line-height: inherit;
  --text-3xl: 39.063px;
  --text-3xl--line-height: inherit;
  --text-4xl: 48.828px;
  --text-4xl--line-height: inherit;
  --text-5xl: 61.035px;
  --text-5xl--line-height: inherit;
  --text-6xl: 76.294px;
  --text-6xl--line-height: inherit;

  /* shadows */
  --shadow-base: 0 0.5rem 1rem --alpha(var(--color-black) / 15%);
  --shadow-sm: 0 0.125rem 0.25rem --alpha(var(--color-black) / 7.5%);
  --shadow-lg: 0 1rem 3rem --alpha(var(--color-black) / 17.5%);
  --shadow-inset: inset 0 1px 2px --alpha(var(--color-black) / 7.5%);

  /* font family */
  --font-sans: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    Roboto, 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji',
    'Segoe UI Emoji', 'Segoe UI Symbol';

  /* breakpoints */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1540px;
}

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