<button class="btn" type="button">
  <strong>SPACE</strong>
  <div id="container-stars">
    <div id="stars"></div>
  </div>

  <div id="glow">
    <div class="circle"></div>
    <div class="circle"></div>
  </div>
</button>

<style>
/* From Uiverse.io by StealthWorm - Tags: button */
.btn {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 13rem;
  height: 3rem;
  background-size: 300% 300%;
  backdrop-filter: blur(1rem);
  border-radius: 5rem;
  transition: 0.5s;
  animation: gra