body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 50px;
  background-color: #f9f9f9;
}

h1 {
  font-size: 2rem;
  margin-bottom: 20px;
}

#counter {
  font-size: 3rem;
  color: green;
  margin-bottom: 20px;
}

button {
  padding: 10px 20px;
  font-size: 1rem;
  cursor: pointer;
}

h2 {
  margin-top: 40px;
}

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

li {
  background: #fff;
  padding: 10px;
  margin: 5px auto;
  max-width: 500px;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}