body {
  font-family: 'Arial', sans-serif;
  background: #f4f4f4;
  text-align: center;
  padding: 20px;
}

header {
  background: #007bff;
  color: white;
  padding: 10px;
  border-radius: 10px;
}

.container {
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
  margin-top: 20px;
}

input {
  width: 80%;
  padding: 10px;
  margin: 10px 0;
  border-radius: 5px;
}

button {
  background: #007bff;
  color: white;
  padding: 10px;
  border-radius: 5px;
  cursor: pointer;
}

#error {
  color: red;
}