body {
    background-color: #f7f7f7;   
    color: #333333;              
    font-family: Arial, Helvetica, sans-serif;
    margin: 10px;
}


h1 {
    text-align: center;
}


nav {
    text-align: center;
    margin-bottom: 20px;
}

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

nav ul li {
    display: inline;
    margin-right: 15px;
}


footer {
    text-align: center;
    margin-top: 20px;
}