How to use not in tailwind css

Tailwind CSS is a utility-first CSS framework that enables you to quickly build designs using utility classes. In Tailwind, the not operator is a variant used to specify that a style applies only when the subsequent class is not present. In other words, the not operator allows you to create a negated selector that applies the style only when no specific class is specified.

css
/* Example: Using the `not` operator */
.input:not(.disabled) {
  /* Apply styles as long as the element is not disabled */
}

In Tailwind CSS, the not operator is typically enabled within the variants section of the configuration file for building utility classes. For instance, if you want to apply certain styles to non-disabled buttons, you must first enable the not operator in the tailwind.config.js file:

javascript
// tailwind.config.js
module.exports = {
  // ...
  variants: {
    extend: {
      backgroundColor: ['not-disabled'], // Enable the `not-disabled` variant here
    },
  },
  // ...
};

Then, you can use the not-disabled variant in HTML to apply styles:

html
<button class="bg-blue-500 text-white not-disabled:bg-green-500">Button</button>

In this example, the not-disabled:bg-green-500 class applies a green background only when the button is not disabled. If the button has the disabled class, the green background is not applied because the not-disabled variant indicates that the style should apply only when the disabled class is not present.