<button class="galaxy-portal-btn">
  <div class="portal-rings">
    <div class="ring ring-1"></div>
    <div class="ring ring-2"></div>
    <div class="ring ring-3"></div>
    <div class="ring ring-4"></div>
  </div>
  <div class="stars-field">
    <div class="star star-1">✦</div>
    <div class="star star-2">✧</div>
    <div class="star star-3">✦</div>
    <div class="star star-4">✧</div>
    <div class="star star-5">✦</div>
    <div class="star star-6">✧</div>
  </div>
  <div class="portal-core">
    <span class="portal-icon">🌌</span>
  </div>
  <div class="energy-waves">
    <div class="wave wave-1"></div>
    <div class="wave wave-2"></div>
    <div class="wave wave-3"></div>
  </div>
</button>