*{
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}

body{
    background-color: brown;
}

header > h1, header > h2{
    background-color: brown;
    text-align: center;
    color: lightgreen;
    padding: 0px 20px
    font-family: 'Courier New', Courier, monospace;
}

header > h1{
    font-size: 3rem;
}

header > h2{
    font-size: 2rem;
}

nav > ul{
    list-style-type: none;
    display: flex;
    flex-direction: column;
}

nav > ul > li{
    width: 100%;
}

nav > ul > li > a{
    background-color: lightgray;
    display:block;
    text-align: center;
    padding: 10px 0px;
    border: black solid 1px;
}

nav > ul > li > a:active{
    background-color: darkgray;
}

main{
    background-color: aquamarine;
}

main > article{
    padding: 10px 15px;
}

footer > p{
    color: lightgreen;
}

/* Surfplatta */
@media screen and (min-width: 600px) {
    header > h1, header > h2{
        background-color: blueviolet;
    }

    main{
        max-width: 700px;
        margin: auto;
    }
}

/* Dator */
@media screen and (min-width: 900px) {

    header > h1, header > h2{
        background-color: lightblue;
    }

    nav > ul{
        flex-direction: row;
    }
}