body {
    font-family: Arial, sans-serif;
    background-color: #f4f6f8;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 800px;
    margin: 40px auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
h1 {
    text-align: center;
    color: #333;
}
ol {
    padding-left: 20px;
}
li {
    margin: 10px 0;
    padding: 10px;
    background: #eef2f7;
    border-radius: 6px;
    transition: 0.3s;
}
li:hover {
    background: #dbe7ff;
    cursor: pointer;
}