demo

				
					body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #4267B2;
    color: white;
    padding: 10px 0;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

#intro, #details {
    background: white;
    margin: 20px 0;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
    position: absolute;
    bottom: 0;
    width: 100%;
}