body { 
    font-family: 'Comic Sans MS';
    font-size: 1em;
    padding: 0;
    margin: 0;
} 

header { 
    background-color: navy;
    box-sizing: border-box;
    padding: 2em 1em;
} 

header h1 {
    color: ivory;
    font-family: 'Comic Sans MS';
    font-size: 2.5em;
    font-variant: small-caps;
    text-align: center;
}

nav { 
    background-color: maroon;
    box-sizing: border-box;
    font-size: .9em;
} 

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

nav li { 
    border-top: 1px solid white;
    padding: .5em;
}

nav li:hover {
    background-color: navy;
}

nav li a {
    text-decoration: none;
    color: ivory;
}

article { 
    box-sizing: border-box;
    padding: 2em;
    min-height: 70vh;
}

article img {
    max-width: 100%;
}

article ul, #hoofdvak ol {
    list-style-position: outside;
    margin-left: 2em;
}

article h1 {
    color: maroon;
}

article h2 {
    color: navy;
}

footer { 
    background-color: navy;
    box-sizing: border-box;
    clear: both;
    color: ivory;
    font-size: .8em;
    padding: 2em;
    text-align: center;
}

@media screen and (min-width: 600px) {
    nav ul, article {
        max-width: 1000px;
        margin: 0 auto;
    }
    nav {
        font-size: 1em;
    }
    nav ul {
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
     }
    nav ul li {
        border-top: none;
        -webkit-box-flex: 1;
        -ms-flex-positive: 1;
        flex-grow: 1;
    }
    nav li {
        text-align: center;
    }
}