Supplying the className to a React/Tailwind component does not replace the default classes

I created a custom button component using Tailwind CSS. The goal is to be able to specify a different `className` when calling the component, however, it currently does not override the default styling.


    const styles = {
      base: 'rounded-3xl px-6 py-2',
      disabled: '',
      variant: {
        solid: 'bg-blue-700 text-white hover:bg-opacity-95',
        outline: 'border border-blue-800 text-blue-900',
      },
    }

    const MyButton = ({
      children,
      type = 'button',
      className,
      variant = 'solid',
      disabled = false,
      onClick,
      ...props
    }: ButtonType) => {
      return (
        <button
          disabled={disabled}
          type={type}
          onClick={onClick}
          className={cx(styles.base, styles.variant[variant], className)}
          {...props}>
          {children}
        </button>
      )
    }
    // Example of how to use the component
    <MyButton className='px-4 py-0'/>
javascriptcssreactjstailwind-css

Answer №1

If you're struggling with specificity issues in your Tailwind CSS project, the tailwind-unimportant plugin could be the solution you need. This plugin introduces a variant that decreases the specificity of component classes, allowing them to be easily overridden.

By updating your component classes to include the unimportant prefix like -:rounded-3xl -:px-6 -:py-2, you can then customize your button using classes without the prefix, such as 

<Button className='px-4 py-0'/>
. Classes without the prefix now take precedence over those with it.

Additionally, consider using the tailwind-merge JS library, which helps eliminate clashes by de-duplicating conflicting classes in your project.

Answer №2

Issue

The problem you are facing seems to stem from the use of the px-4 py-0 classes in the className attribute for the <Button> component. This results in a specific order of CSS classes being applied:

<button class="… px-6 py-2 … px-4 py-0">

When multiple CSS rules with equal specificity are present (such as px-6, py-2, px-4, and py-0 all having specificity 0 1 0), the rule listed later in the stylesheet will override any preceding rules.

This suggests that the Tailwind-generated CSS likely resembles:

.px-4 {
  /* … */
}

.px-6 {
  /* … */
}

.py-0 {
  /* … */
}

.py-2 {
  // …
}

Therefore, px-6 will always take precedence over px-4, and py-2 will always take precedence over py-0.

Possible Solutions

!important Modifier

You might want to consider using the !important modifier on the classes that need priority, like so:

<Button className="!px-4 !py-0">

Default/Conditional Classes

An alternative approach could involve selectively including the px-6 and py-2 classes only if no other px-* or py-* classes are provided to the component. There are various ways to achieve this, such as utilizing separate props:

const classes = {
  base: 'rounded-3xl',
  // …
};

const Button = ({
  // …
  px = 'px-6',
  py = 'py-2',
  ...props
}) => {
  return (
    <button
      // …
      className={cx(
        classes.base,
        classes.variant[variant],
        px,
        py,
        className
      )}
      {...props}
    >
      {children}
    </button>
  )
}

<Button px='px-4' py='py-0'>

Alternatively, you can leverage the existing variant pattern in the following way:

const classes = {
  base: 'rounded-3xl',
  // …
  size: {
    normal: 'px-6 py-2',
    foo: 'px-4 py-0',
  }
};

const Button = ({
  // …
  size= 'normal',
  ...props
}) => {
  return (
    <button
      // …
      className={cx(
        classes.base,
        classes.variant[variant],
        classes.size[size],
        className
      )}
      {...props}
    >
      {children}
    </button>
  )
}

<Button size="foo">

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