body {
  font-family: Arial;
  background: #eef;
  padding: 20px;
}

.card {
  background: #fff;
  padding: 15px;
  border-radius: 10px;
}

button {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  background: #0078d4;
  color: white;
  border: none;
}