You're looking at the documentation for Tailwind CSS v2.
Tailwind CSS on GitHub

Background Blend Mode

Tailwind CSS version
v2.1+

Utilities for controlling how an element's background image should blend with its background color.

Default class reference

Class
Properties
bg-blend-normalbackground-blend-mode: normal;
bg-blend-multiplybackground-blend-mode: multiply;
bg-blend-screenbackground-blend-mode: screen;
bg-blend-overlaybackground-blend-mode: overlay;
bg-blend-darkenbackground-blend-mode: darken;
bg-blend-lightenbackground-blend-mode: lighten;
bg-blend-color-dodgebackground-blend-mode: color-dodge;
bg-blend-color-burnbackground-blend-mode: color-burn;
bg-blend-hard-lightbackground-blend-mode: hard-light;
bg-blend-soft-lightbackground-blend-mode: soft-light;
bg-blend-differencebackground-blend-mode: difference;
bg-blend-exclusionbackground-blend-mode: exclusion;
bg-blend-huebackground-blend-mode: hue;
bg-blend-saturationbackground-blend-mode: saturation;
bg-blend-colorbackground-blend-mode: color;
bg-blend-luminositybackground-blend-mode: luminosity;

Usage

Use the bg-blend-{mode} utilities to control how an element’s background image should be blended its background color.

<div class="bg-blend-multiply ...">
  <!-- ... -->
</div>

Responsive

To control the background-blend-mode property at a specific breakpoint, add a {screen}: prefix to any existing background-blend-mode utility. For example, use md:bg-blend-darken to apply the bg-blend-darken utility at only medium screen sizes and above.

<div class="bg-blend-lighten md:bg-blend-darken ...">
  <!-- ... -->
</div>

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

Customizing

Variants

By default, only responsive variants are generated for background-blend-mode utilities.

You can control which variants are generated for the background-blend-mode utilities by modifying the backgroundBlendMode 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: {
        // ...
+       backgroundBlendMode: ['hover', 'focus'],
      }
    }
  }

Disabling

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

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