A TailwindCSS glowing gradient border button

GlowingGradientBorderButton.tsx

import React from 'react'

function cn(...classes: any[]) {
  return classes.filter(Boolean).join(' ')
}

type Props = {
  gradient: string    // 'bg-gradient-to-r from-red-600 via-purple-600 to-blue-600',
  children: React.ReactNode
  href: string
  target?: string
  rel?: string
}

export default function GlowingGradientBorderButton({
  gradient,
  children,
  href,
  target = '_blank',
  rel = 'noreferrer noopener'
}: Props) {
  return (
    <div className="flex justify-center">
      <div className="relative group">
        <div className={
          cn(
            'absolute -inset-0.5 rounded-2xl blur group-hover:blur-xl opacity-75 transition duration-500 group-hover:duration-200 group-hover:opacity-100 will-change-filter overflow-hidden',
            gradient
          )}
        />
        <a
          className="relative block w-64 h-16 md:h-20 group-hover:scale-105 duration-500 group-hover:duration-200"
          href={href}
          target={target}
          rel={rel}
        >
          <span className={cn('block h-full inset-0.5 rounded-xl p-1', gradient)}>
            <span className="h-full items-center px-6 bg-neutral-900 text-neutral-50 rounded-lg">
              {children}
            </span>
          </span>
        </a>
      </div>
    </div>
  )
}

tailwind.config.js

// this is necessary to fix the blur effect in safari
//...
  theme: {
    extend: {
      willChange: {
        'filter': 'filter',
      }
    },
  },
//...

A glowing gradient border button built with pure TailwindCSS

Size is fixed, sou you will have to adjust it to your needs.
You must pass the gradient style as prop. See comment for inspiration.

This is how it looks in action:

Screen.Recording.2022-10-18.at.9.03.13.AM.mov