body {
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
    text-align: center;
    margin-top: 50px;
}
h1 {
    color: #333;
}
form {
  margin-top: 20px;
}
input {
  padding: 8px;
  width: 250px;
}
button {
  padding: 8px 12px;
}
ul {
  margin-top: 20px;
  list-style: none;
  padding: 0;
}
li {
  background: #fff;
  margin-bottom: 8px;
  padding: 10px;
  border-radius: 5px;
}