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

header > h1, header > h2{
    background-color: brown;
    color: lightgreen;
    text-align: center;
    padding: 0px 20px;
}

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: lightgrey;
    display: block;
    text-align: center;
    padding: 10px 0px;
    border: black solid 1px;
}

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

main {
    min-height: 500px;
    background-color: aquamarine;
}

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

footer {
    background-color: lightcyan;
}

/* Surfplatta */

@media screen and (min-width: 600px) {

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

    
    nav > ul {
        flex-direction: row;
    }

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

}

/* Dator */

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

    body {
        max-width: 1000px;
        margin: auto;
    }

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