Width

Auto

Use w-auto to let the browser calculate and select the width for the element. You can use it to unset a specific width:

<div class="w-24 md:w-auto ..."></div>

Screen Width

Use w-screen to make an element span the entire width of the viewport.

<div class=" h-12 w-screen"></div>

Fixed Width

Use w-{number} or w-px to set an element to a fixed width.

Fluid Width

Use w-{fraction} or w-full to set an element to a percentage based width.

Responsive

To control the width of an element at a specific breakpoint, add a {screen}: prefix to any existing width utility. For example, adding the class md:w-full to an element would apply the w-full utility at medium screen sizes and above.

<div class="w-1/2 md:w-full ...">
  <!-- ... -->
</div>

For more information about Tailwind's responsive design features, check out the Responsive Design documentation.

Customizing

Width scale

By default, Tailwind's width scale is a combination of the default spacing scale as well as some additional values specific to widths.

You can customize the spacing scale for padding, margin, width, and height all at once in the theme.spacing or theme.extend.spacing sections of your tailwind.config.js file:

  // tailwind.config.js
  module.exports = {
    theme: {
      extend: {
+       spacing: {
+         '72': '18rem',
+         '84': '21rem',
+         '96': '24rem',
+       }
      }
    }
  }

To customize width separately, use the theme.width section of your tailwind.config.js file.

  // tailwind.config.js
  module.exports = {
    theme: {
      extend: {
+       width: {
+         '1/7': '14.2857143%',
+         '2/7': '28.5714286%',
+         '3/7': '42.8571429%',
+         '4/7': '57.1428571%',
+         '5/7': '71.4285714%',
+         '6/7': '85.7142857%',
+       }
      }
    }
  }

Learn more about customizing the default theme in the theme customization documentation.

Variants

By default, only responsive variants are generated for width utilities.

You can control which variants are generated for the width utilities by modifying the width property in the variants section of your tailwind.config.js file.

For example, this config will also generate hover and focus variants:

  // tailwind.config.js
  module.exports = {
    variants: {
      extend: {
        // ...
+       width: ['hover', 'focus'],
      }
    }
  }

Disabling

If you don't plan to use the width utilities in your project, you can disable them entirely by setting the width property to false in the corePlugins section of your config file:

  // tailwind.config.js
  module.exports = {
    corePlugins: {
      // ...
+     width: false,
    }
  }