body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}
.container {
  background: #fff;
  padding: 2em;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
form {
  display: flex;
  flex-direction: column;
}
input, button {
  margin: 0.5em 0;
  padding: 0.8em;
  font-size: 1em;
}
button {
  background-color: #007BFF;
  color: white;
  border: none;
  cursor: pointer;
}
button:hover {
  background-color: #0056b3;
}
footer {
  position: absolute;
  bottom: 1em;
  font-size: 0.9em;
  color: #666;
}
.error {
  color: red;
  margin-top: 0.5em;
}