Animated Gradient CTA Button

<div class="flex items-center justify-center min-h-screen"><a href="#"
  class="inline-flex items-center justify-center text-[15px] transition-all duration-500 hover:scale-105 hover:shadow-2xl [animation:fadeSlideIn_0.8s_ease-out_0.7s_both] font-medium text-white h-11 rounded-full pr-6 pl-6"
  style="background: radial-gradient(circle, rgba(58, 17, 124, 0.95) 0%, rgba(58, 17, 124, 0) 65%), url(&quot;data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 400 120%22 preserveAspectRatio=%22none%22%3E%3Cdefs%3E%3ClinearGradient id=%22g%22 x1=%220%25%22 y1=%220%25%22 x2=%22100%25%22 y2=%220%25%22%3E%3Cstop offset=%220%25%22 stop-color=%22%235B21B6%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%235B21B6;%236B21A8;%234C1D95;%234B3FF6;%235B21B6%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3Cstop offset=%2250%25%22 stop-color=%22%234C1D95%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%234C1D95;%234B3FF6;%235B21B6;%236B21A8;%234C1D95%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3Cstop offset=%22100%25%22 stop-color=%22%234B3FF6%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%234B3FF6;%235B21B6;%236B21A8;%234C1D95;%234B3FF6%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width=%22400%22 height=%22120%22 fill=%22url(%23g)%22/%3E%3C/svg%3E&quot;); box-shadow: rgba(0, 0, 0, 0.35) 0px -18px 28px inset, rgba(255, 255, 255, 0.25) 0px 3px 6px inset, rgba(0, 0, 0, 0.6) 0px 10px 25px; text-shadow: rgba(0, 0, 0, 0.75) 0px 1px 3px; filter: brightness(0.85) saturate(1.25)"
  onmouseover="this.style.background=`radial-gradient(circle at 50% 50%, rgba(76, 29, 149, 0.95) 0%, rgba(76, 29, 149, 0) 65%), url('data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 400 120%22 preserveAspectRatio=%22none%22%3E%3Cdefs%3E%3ClinearGradient id=%22g%22 x1=%220%25%22 y1=%220%25%22 x2=%22100%25%22 y2=%220%25%22%3E%3Cstop offset=%220%25%22 stop-color=%22%237C3AED%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%237C3AED;%238B5CF6;%236366F1;%2360A5FA;%237C3AED%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3Cstop offset=%2250%25%22 stop-color=%22%236366F1%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%236366F1;%2360A5FA;%237C3AED;%238B5CF6;%236366F1%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3Cstop offset=%22100%25%22 stop-color=%22%2360A5FA%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%2360A5FA;%237C3AED;%238B5CF6;%236366F1;%2360A5FA%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width=%22400%22 height=%22120%22 fill=%22url(%23g)%22/%3E%3C/svg%3E')`; this.style.boxShadow=`inset 0 -18px 28px rgba(255, 255, 255, 0.95), inset 0 3px 6px rgba(255, 255, 255, 0.5), 0 10px 25px rgba(0, 0, 0, 0.5)`; this.style.textShadow=`0 1px 2px rgba(0, 0, 0, 0.6)`; this.style.filter=`brightness(0.85) saturate(1.2)`;"
  onmouseout="this.style.background=`radial-gradient(circle at 50% 50%, rgba(58, 17, 124, 0.95) 0%, rgba(58, 17, 124, 0) 65%), url('data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 400 120%22 preserveAspectRatio=%22none%22%3E%3Cdefs%3E%3ClinearGradient id=%22g%22 x1=%220%25%22 y1=%220%25%22 x2=%22100%25%22 y2=%220%25%22%3E%3Cstop offset=%220%25%22 stop-color=%22%235B21B6%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%235B21B6;%236B21A8;%234C1D95;%234B3FF6;%235B21B6%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3Cstop offset=%2250%25%22 stop-color=%22%234C1D95%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%234C1D95;%234B3FF6;%235B21B6;%236B21A8;%234C1D95%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3Cstop offset=%22100%25%22 stop-color=%22%234B3FF6%22%3E%3Canimate attributeName=%22stop-color%22 values=%22%234B3FF6;%235B21B6;%236B21A8;%234C1D95;%234B3FF6%22 dur=%224s%22 repeatCount=%22indefinite%22/%3E%3C/stop%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width=%22400%22 height=%22120%22 fill=%22url(%23g)%22/%3E%3C/svg%3E')`; this.style.boxShadow=`inset 0 -18px 28px rgba(0, 0, 0, 0.35), inset 0 3px 6px rgba(255, 255, 255, 0.25), 0 10px 25px rgba(0, 0, 0, 0.6)`; this.style.textShadow=`0 1px 3px rgba(0, 0, 0, 0.75)`; this.style.filter=`brightness(0.85) saturate(1.25)`;">
  Let's get started
</a>