body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background: #eef2f3;
}
header {
    background-color: #333;
    color: white;
    padding: 10px 20px;
}
ul {
    list-style: none;
    padding: 0;
}
li {
    background: white;
    margin-bottom: 10px;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 0 5px #ccc;
}
button {
    background: #007bff;
    color: white;
    border: none;
    padding: 8px;
    margin-left: 10px;
    border-radius: 4px;
    cursor: pointer;
}
button:hover {
    background: #0056b3;
}