body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background-color: #f9f9f9;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

.input-group {
  margin-bottom: 10px;
}

label {
  display: block;
  margin-bottom: 5px;
}

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

button {
  width: 100%;
  padding: 10px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  margin-top: 10px;
}

button:hover {
  background-color: #0056b3;
}

#calendar {
  margin-top: 20px;
}

@media only screen and (max-width: 600px) {
  .container {
    padding: 10px;
  }

  input, button {
    padding: 5px;
  }
}