Animated Radial Gradient CTA Button

<div class="relative inline-block group text-sm rounded-full">
  <button class="group relative inline-flex min-w-[120px] cursor-pointer transition-all duration-[1000ms] ease-[cubic-bezier(0.15,0.83,0.66,1)] hover:-translate-y-[3px] hover:scale-[1.1] hover:text-white text-xs font-semibold text-white/70 tracking-tight rounded-full pt-[12px] pr-[17px] pb-[12px] pl-[17px] items-center justify-center" style="box-shadow:inset 0 0 0 1px rgba(255,255,255,0.1);background:radial-gradient(ellipse at bottom,rgba(55,55,55,1) 0%,rgba(0,0,0,1) 100%);">
  <span class="relative z-10 font-normal rounded-full text-xs">Get in touch</span>

  <!-- replaces the old ::before underline -->
  <span aria-hidden="true" class="absolute bottom-0 left-1/2 h-[1px] w-[70%] -translate-x-1/2 opacity-20 transition-all duration-[1000ms] ease-[cubic-bezier(0.15,0.83,0.66,1)] group-hover:opacity-80 rounded-full text-xs" style="background:linear-gradient(90deg,rgba(255,255,255,0) 0%,rgba(255,255,255,1) 50%,rgba(255,255,255,0) 100%);"></span>
</button>
  <span class="pointer-events-none absolute -bottom-3 left-1/2 z-0 h-6 w-44 -translate-x-1/2 opacity-0 transition-opacity duration-300 ease-out group-hover:opacity-100 rounded-full text-sm" style="background: radial-gradient(60% 100% at 50% 50%, rgba(255,255,255,.55), rgba(255,255,255,.28) 35%, transparent 70%); filter: blur(10px) saturate(120%);" aria-hidden="true"></span>
</div>