body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background-image: url('background.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  justify-content: center;
  align-items: center;
}

@media (max-width: 600px) {
  body {
    background-image: url('backgroundPhone.png');
  }
}

.center-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
}

.download-btn {
  background-color: #e53935;
  color: #fff;
  padding: 1rem 2.5rem;
  border: none;
  border-radius: 30px;
  font-size: 1.3rem;
  font-family: inherit;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  transition: background 0.2s;
  cursor: pointer;
}

.download-btn:hover {
  background-color: #b71c1c;
}