body{
    background-color: white;
    width: 800px;
    margin: 0 auto;
}
header{
    background-color:white;
    padding: 10px 25px;
}
nav {
    background-color: whitesmoke;
    text-align: center;
}
nav a{
    text-decoration: none;
    color: black;
    text-transform: uppercase;
    background-color: whitesmoke;
    padding: 5px 10px;
    margin: 0 5px;
    display: inline-block;
}
nav a:hover {
    color:cornflowerblue;
}
main{
    background-color: white;
    padding: 30px;
    overflow: auto;
}

footer{
    background-color: whitesmoke;
    padding: 30px;
}
h1{
    color: black;
    font-family: Verdana;
    text-align: center;
}
nav a.active {
    color: cornflowerblue;
}