body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #101827;
  color: white;
  font-family: Arial, sans-serif;
  text-align: center;
}

.circle {
  width: 100px;
  height: 100px;
  margin: 0 auto 35px;
  border-radius: 50%;
  background: linear-gradient(135deg, #60a5fa, #a78bfa);
  animation: float 2s ease-in-out infinite alternate;
}

@keyframes float {
  to { transform: translateY(-25px) rotate(20deg); }
}

button {
  padding: 14px 24px;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
}

main.active .circle {
  animation: spin .8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}