body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

h1 {
  text-align: center;
}

.container {
  max-width: 600px;
  margin: 0 auto;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  padding: 10px;
  border: 1px solid #ccc;
  margin-bottom: 5px;
  cursor: pointer;
}

li:hover {
  background-color: #f2f2f2;
}