body {
  font-family: sans-serif;
  padding: 2rem;
  background: #f3f3f3;
  text-align: center;
}
h1 {
  font-size: 1.5rem;
}
form {
  margin-top: 1rem;
}
input[type="file"] {
  margin-bottom: 1rem;
}
button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
}
#status {
  margin-top: 1rem;
  font-weight: bold;
}