body {
    font-family: Arial, sans-serif;
    padding: 20px;
}

h1 {
    color: #333;
}

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

li {
    padding: 10px;
    margin: 5px 0;
    background: #f0f0f0;
    cursor: pointer;
    border: 1px solid #ccc;
}

hr {
    margin: 20px 0;
}

#outer, #out {
    padding: 20px;
    background: #f9f9f9;
    border: 1px solid #ddd;
    margin-top: 10px;
}

button {
    padding: 10px 20px;
    background: #007BFF;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}