body {
    width: 800px;
    font-family: sans-serif;
    margin: 0px auto;
}
h1{
    text-align: center;
}
nav {
    text-align: center;
}
nav a{
    transition: 0.5s;
    padding 5px;
    font-size: 18px;
}
nav a:hover{
    font-size: 22px;
    transition: 0.5s;
}