body {
  background: #111;
  color: white;
  font-family: Arial;
}

.container {
  width: 350px;
  margin: 40px auto;
}

.card {
  background: #fff;
  color: black;
  padding: 15px;
  margin-bottom: 20px;
}

.input-box input {
  width: 100%;
  padding: 8px;
}

button {
  margin-top: 10px;
  width: 100%;
  padding: 8px;
  cursor: pointer;
}

.hidden {
  display: none;
}

.error {
  color: red;
  text-align: center;
}