body{
    font-family: sans-serif;
    margin:40px;
}

nav a{
    margin-right:20px;
    color:#0066cc;
    text-decoration:none;
}

nav a:hover{
    text-decoration:underline;
}

#app{
    margin-top:30px;
    padding:20px;
    border:1px solid #ddd;
    border-radius:8px;
}