body, html {
  height: 100%;
  margin: 0;
  font-family: sans-serif;
}

.background-container {
  background-image: url('background.jpg'); /* replace with your image file */
  background-size: cover;
  background-position: center;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 2rem;
}

form, #success-message {
  background-color: rgba(255, 255, 255, 0.9);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}