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  • License MIT

Elastic responsive utilities for Tailwind CSS v4 with intelligent clamp() and container query support

Package Exports

  • tailwind-elasticss
  • tailwind-elasticss/index.css

Readme

tailwind-elasticss

Elastic responsive utilities for Tailwind CSS v4 with intelligent clamp() and container query support.

npm version License: MIT

Features

✨ Automatic clamp() calculation - No manual math required 🎯 Container query support - Respond to parent container size 🔧 Customizable via CSS variables - Full control when you need it ⚡ Zero JavaScript - Pure CSS solution for Tailwind CSS v4 📦 Tiny footprint - Just CSS utilities, no dependencies 📝 Typography support - Fluid font-size and line-height utilities

Installation

npm install tailwind-elasticss

Usage

Add the plugin to your CSS file:

@import "tailwindcss";
@import "tailwind-elasticss";

Table of Contents

Layout Utilities

Width & Height

Fluid width and height that automatically scales between 88% and 120% of the base value.

<!-- Automatic: clamp(176px, 200px, 240px) -->
<div class="w-fluid-[200px]">Auto-calculated fluid width</div>

<!-- Height: clamp(264px, 300px, 360px) -->
<div class="h-fluid-[300px]">Auto-calculated fluid height</div>

With custom bounds:

<!-- Custom min/max bounds -->
<div class="fluid-min-[150px] fluid-max-[300px] w-fluid-[200px]">
  <!-- width: clamp(150px, 200px, 300px) -->
</div>

<!-- Works with percentages -->
<div class="fluid-max-[95%] w-fluid-[200px]">
  <!-- width: clamp(176px, 200px, 95%) -->
</div>

Max Width & Max Height

Fluid max-width and max-height utilities.

<!-- max-width: clamp(704px, 800px, 960px) -->
<div class="max-w-fluid-[800px]">Fluid max-width</div>

<!-- max-height: clamp(352px, 400px, 480px) -->
<div class="max-h-fluid-[400px]">Fluid max-height</div>

With custom bounds:

<div class="fluid-max-w-min-[500px] fluid-max-w-max-[1200px] max-w-fluid-[800px]">
  <!-- max-width: clamp(500px, 800px, 1200px) -->
</div>

Typography Utilities

Font Size

Fluid font-size that automatically scales for responsive typography.

<!-- Basic: clamp(28.16px, 32px, 38.4px) -->
<h1 class="text-fluid-[32px]">Fluid heading</h1>

<!-- With custom min -->
<h1 class="fluid-text-min-[24px] text-fluid-[32px]">
  <!-- font-size: clamp(24px, 32px, 38.4px) -->
</h1>

<!-- With custom max -->
<p class="fluid-text-max-[20px] text-fluid-[16px]">
  <!-- font-size: clamp(14.08px, 16px, 20px) -->
</p>

Fluid typography scale:

<div class="fluid-text-min-[14px] fluid-text-max-[72px]">
  <h1 class="text-fluid-[48px]">Display heading</h1>
  <h2 class="text-fluid-[32px]">Subheading</h2>
  <p class="text-fluid-[16px]">Body text</p>
  <!-- All respect the same min/max bounds -->
</div>

Line Height

Fluid line-height for optimal readability at any size.

<!-- Basic: clamp(21.12px, 24px, 28.8px) -->
<p class="leading-fluid-[24px]">Fluid line-height</p>

<!-- With custom bounds -->
<h2 class="fluid-leading-min-[28px] fluid-leading-max-[48px] leading-fluid-[36px]">
  <!-- line-height: clamp(28px, 36px, 48px) -->
</h2>

<!-- Relative values (unitless) -->
<p class="leading-fluid-[1.5]">
  <!-- line-height: clamp(1.32, 1.5, 1.8) -->
</p>

Combining font-size and line-height:

<div class="fluid-text-min-[14px] fluid-text-max-[72px]
            fluid-leading-min-[20px] fluid-leading-max-[96px]">
  <h1 class="text-fluid-[48px] leading-fluid-[56px]">Title</h1>
  <p class="text-fluid-[16px] leading-fluid-[24px]">
    Text with fully fluid typography
  </p>
</div>

Container Queries

All utilities have container query variants that respond to parent container size instead of viewport.

Requires @container on parent element.

Layout with Container Queries

<div class="@container">
  <!-- Responds to container size -->
  <div class="w-fluid-cq-[250px]">Container-aware width</div>

  <!-- Max-width variant -->
  <article class="max-w-fluid-cq-[600px]">Container-aware max-width</article>
</div>

Breakpoint behavior:

  • < 400px: Compression (85% - 115%)
  • 400px - 800px: Balance (90% - 130%)
  • > 800px: Fixed value (or custom via --fluid-override)

Typography with Container Queries

<article class="@container">
  <h1 class="text-fluid-cq-[32px] leading-fluid-cq-[40px]">
    Typography that adapts to container width
  </h1>
  <p class="text-fluid-cq-[16px] leading-fluid-cq-[24px]">
    Maintains optimal proportions at any container size
  </p>
</article>

Customization

Global Customization

Define bounds for multiple elements:

<div class="fluid-min-[100px] fluid-max-[500px]">
  <div class="w-fluid-[200px]">Element 1</div>
  <div class="w-fluid-[300px]">Element 2</div>
  <div class="w-fluid-[400px]">Element 3</div>
  <!-- All inherit min: 100px, max: 500px -->
</div>

Override in Large Containers

<div class="@container" style="--fluid-override: 300px">
  <div class="w-fluid-cq-[250px]">
    <!-- Uses 300px fixed in containers > 800px -->
  </div>
</div>

Typography Customization

<div style="--fluid-text-min: 14px;
            --fluid-text-max: 20px;
            --fluid-leading-min: 20px;
            --fluid-leading-max: 32px">
  <p class="text-fluid-cq-[16px] leading-fluid-cq-[24px]">
    Full control over size and line-height bounds
  </p>
</div>

Complete API Reference

Viewport-based Utilities

Respond to viewport/window size.

Utility CSS Variable (min) CSS Variable (max) Default Behavior
w-fluid-[value] --fluid-min --fluid-max 88% → 120%
h-fluid-[value] --fluid-min --fluid-max 88% → 120%
max-w-fluid-[value] --fluid-max-w-min --fluid-max-w-max 88% → 120%
max-h-fluid-[value] --fluid-max-w-min --fluid-max-w-max 88% → 120%
text-fluid-[value] --fluid-text-min --fluid-text-max 88% → 120%
leading-fluid-[value] --fluid-leading-min --fluid-leading-max 88% → 120%

Container Query Utilities

Respond to parent container size.

Utility Breakpoints Behavior
w-fluid-cq-[value] < 400px: 85%→115%
400-800px: 90%→130%
> 800px: Fixed		 Container-aware
h-fluid-cq-[value] Same as above Container-aware
max-w-fluid-cq-[value] Same as above Container-aware
max-h-fluid-cq-[value] Same as above Container-aware
text-fluid-cq-[value] Same as above Container-aware
leading-fluid-cq-[value] Same as above Container-aware

CSS Variable Utilities

Control bounds for fluid utilities.

Utility Sets Variable Used By
fluid-min-[value] --fluid-min w-fluid-*, h-fluid-*
fluid-max-[value] --fluid-max w-fluid-*, h-fluid-*
fluid-max-w-min-[value] --fluid-max-w-min max-w-fluid-*, max-h-fluid-*
fluid-max-w-max-[value] --fluid-max-w-max max-w-fluid-*, max-h-fluid-*
fluid-text-min-[value] --fluid-text-min text-fluid-*
fluid-text-max-[value] --fluid-text-max text-fluid-*
fluid-leading-min-[value] --fluid-leading-min leading-fluid-*
fluid-leading-max-[value] --fluid-leading-max leading-fluid-*

Examples

Responsive Sidebar

<div class="@container flex">
  <aside class="w-fluid-cq-[250px] bg-gray-800 @container">
    <h3 class="text-fluid-cq-[20px] leading-fluid-cq-[28px]">
      Sidebar Title
    </h3>
    <p class="text-fluid-cq-[14px] leading-fluid-cq-[20px]">
      Text adapts to sidebar width
    </p>
  </aside>
  <main class="flex-1">
    <!-- Main content -->
  </main>
</div>

Article with Fluid Typography

<article class="@container w-full max-w-fluid-cq-[800px] mx-auto px-4">
  <header class="@container">
    <h1 class="text-fluid-cq-[36px] leading-fluid-cq-[44px]">
      Article Title
    </h1>
    <p class="text-fluid-cq-[14px] leading-fluid-cq-[20px] text-gray-600">
      Published on Jan 1, 2025
    </p>
  </header>
  <div class="@container mt-8">
    <p class="text-fluid-cq-[18px] leading-fluid-cq-[28px]">
      Article content with typography that adapts perfectly
      to the container width, maintaining optimal readability.
    </p>
  </div>
</article>

Complete Typography Scale

<div class="fluid-text-min-[12px] fluid-text-max-[96px]
            fluid-leading-min-[16px] fluid-leading-max-[112px]">
  <h1 class="text-fluid-[64px] leading-fluid-[72px]">Display</h1>
  <h2 class="text-fluid-[48px] leading-fluid-[56px]">Heading 1</h2>
  <h3 class="text-fluid-[32px] leading-fluid-[40px]">Heading 2</h3>
  <h4 class="text-fluid-[24px] leading-fluid-[32px]">Heading 3</h4>
  <p class="text-fluid-[16px] leading-fluid-[24px]">Body text</p>
  <small class="text-fluid-[14px] leading-fluid-[20px]">Small text</small>
</div>
<div class="fluid-min-[300px] fluid-max-[90%] w-fluid-[500px]">
  <!-- width: clamp(300px, 500px, 90%) -->
  <h2 class="text-fluid-[24px] leading-fluid-[32px]">Modal Title</h2>
  <p class="text-fluid-[16px] leading-fluid-[24px]">Modal content...</p>
</div>

Grid with Container-Aware Cards

<div class="@container grid grid-cols-[repeat(auto-fit,minmax(200px,1fr))] gap-4">
  <div class="@container p-4 bg-white rounded-lg shadow">
    <h3 class="text-fluid-cq-[20px] leading-fluid-cq-[28px]">Card Title</h3>
    <p class="text-fluid-cq-[14px] leading-fluid-cq-[20px]">
      Each card responds to its grid cell size, not the viewport
    </p>
  </div>
  <div class="@container p-4 bg-white rounded-lg shadow">
    <h3 class="text-fluid-cq-[20px] leading-fluid-cq-[28px]">Card Title</h3>
    <p class="text-fluid-cq-[14px] leading-fluid-cq-[20px]">
      Typography scales perfectly at any card width
    </p>
  </div>
</div>

Reusable Bounds for Consistency

<div class="fluid-min-[100px] fluid-max-[500px]
            fluid-text-min-[14px] fluid-text-max-[24px]">
  <div class="w-fluid-[200px]">
    <h3 class="text-fluid-[20px]">Card 1</h3>
  </div>
  <div class="w-fluid-[300px]">
    <h3 class="text-fluid-[20px]">Card 2</h3>
  </div>
  <div class="w-fluid-[400px]">
    <h3 class="text-fluid-[20px]">Card 3</h3>
  </div>
  <!-- All inherit the same min/max bounds -->
</div>

Dashboard Layout

<div class="@container grid grid-cols-1 md:grid-cols-3 gap-6">
  <!-- Widget 1 -->
  <div class="@container p-6 bg-white rounded-lg">
    <h2 class="text-fluid-cq-[24px] leading-fluid-cq-[32px] font-bold">
      Statistics
    </h2>
    <p class="text-fluid-cq-[48px] leading-fluid-cq-[56px] font-bold text-blue-600">
      1,234
    </p>
    <p class="text-fluid-cq-[14px] leading-fluid-cq-[20px] text-gray-600">
      Total users
    </p>
  </div>

  <!-- Widget 2 -->
  <div class="@container p-6 bg-white rounded-lg">
    <h2 class="text-fluid-cq-[24px] leading-fluid-cq-[32px] font-bold">
      Revenue
    </h2>
    <p class="text-fluid-cq-[48px] leading-fluid-cq-[56px] font-bold text-green-600">
      $45K
    </p>
    <p class="text-fluid-cq-[14px] leading-fluid-cq-[20px] text-gray-600">
      This month
    </p>
  </div>

  <!-- Widget 3 -->
  <div class="@container p-6 bg-white rounded-lg">
    <h2 class="text-fluid-cq-[24px] leading-fluid-cq-[32px] font-bold">
      Growth
    </h2>
    <p class="text-fluid-cq-[48px] leading-fluid-cq-[56px] font-bold text-purple-600">
      +23%
    </p>
    <p class="text-fluid-cq-[14px] leading-fluid-cq-[20px] text-gray-600">
      vs last month
    </p>
  </div>
</div>

When to Use What

Viewport-based (-fluid-*)

Use when you need elements to respond to the viewport/window size:

  • Global typography scales
  • Full-width sections
  • Elements that should adapt to screen size
  • No specific parent container

Container Query-based (-fluid-cq-*)

Use when elements should respond to their container:

  • Modular components (cards, widgets)
  • Sidebars and panels
  • Grid/flex items
  • Nested layouts
  • Responsive components that can be placed anywhere

Width/Height vs Max-Width/Max-Height

  • w-fluid-* / h-fluid-*: Fixed but scalable dimensions
  • max-w-fluid-* / max-h-fluid-*: Fluid upper limit, combine with w-full for responsive containers

Font-Size vs Line-Height

  • Always combine them for optimal typography
  • Use same bounds for consistency across your scale
  • Container queries ensure perfect proportions at any size

Browser Support

  • Chrome/Edge 105+
  • Firefox 110+
  • Safari 16+

Container queries require modern browser support. Check caniuse.com for details.

Requirements

  • Tailwind CSS v4.0.0 or higher

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT © [Your Name]