body {
  font-family: Arial;
  text-align: center;
  background-color: #f5f5f5;
}
.container {
  margin: 100px auto;
  width: 80%;
  max-width: 600px;
}
input {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
}
button {
  padding: 10px 20px;
  background-color: #007bff;
  color: white;
  border: none;
}
iframe {
  border: none;
}