body {
  margin: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: sans-serif;
  background: linear-gradient(to right, #f7f8f9, #e1e2e3);
  padding: 1rem;
}

.box {
  background: white;
  padding: 2rem 3rem;
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
  text-align: center;
  max-width: 400px;
  width: 100%;
}

.logo {
  width: 260px;
  max-width: 100%;
  height: auto;
  margin-bottom: 20px;
}

@keyframes pulseGlow {
  0% {
    transform: scale(1);
    background-color: black;
    box-shadow: 0 0 0px rgba(0, 0, 0, 0);
  }
  50% {
    transform: scale(1.05);
    background-color: #2c2c2c;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
  }
  100% {
    transform: scale(1);
    background-color: black;
    box-shadow: 0 0 0px rgba(0, 0, 0, 0);
  }
}

button {
  padding: 1rem 2rem;
  font-size: 1rem;
  background: black;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  max-width: 300px;
  animation: pulseGlow 2s infinite;
  transition: background 0.3s ease;
  transform-origin: center; 
}

button span {
  display: inline-block;
  vertical-align: middle;
}
button:hover {
  background: #333;
}

@media (max-width: 480px) {
  .box {
    padding: 1.5rem 1.5rem;
  }

  .logo {
    width: 200px;
  }

  button {
    padding: 0.9rem 1.5rem;
    font-size: 0.95rem;
  }
}