/* Element selector */
body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #f0f0f0;
}

/* Class selector */
.highlight {
    color: #0066cc;
    font-weight: bold;
}

/* ID selector */
#main-title {
    color: #333;
    text-align: center;
    border-bottom: 2px solid #0066cc;
    padding-bottom: 10px;
}


h2, h3 {
    color: #444;
}

ul {
    background-color: white;
    padding: 20px 40px;
    border-radius: 5px;
}

img {
    max-width: 100%;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 5px;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

footer {
    margin-top: 30px;
    text-align: center;
    color: #666;
    font-size: 0.9em;
}