body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  padding: 20px;
}
form {
  max-width: 500px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
}
.step {
  display: none;
}
.step.active {
  display: block;
}
label {
  display: block;
  margin: 10px 0;
}
input {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
}
button {
  margin-top: 15px;
  padding: 10px 15px;
}