#restaurant-booking-form {
  max-width: 400px;
  margin: 20px auto;
}
#restaurant-booking-form input,
#restaurant-booking-form select {
  width: 100%;
  margin: 5px 0;
  padding: 8px;
  box-sizing: border-box;
}
#restaurant-booking-form input[type="submit"] {
  background: #0073aa;
  color: #fff;
  border: 0;
  cursor: pointer;
}
#restaurant-booking-form input[type="submit"]:hover {
  background: #005177;
}