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

header>h1,
header>h2 {
    background-color: brown;
    color: lightgreen;
    text-align: center;
    font-family: 'Courier New', Courier, monospace;
    padding: 5px 20px;
}

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

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

nav>ul {
    margin: 10px;
    list-style-type: none;
    display: flex;
    flex-direction: column;
}

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

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

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


main {
    margin:10px;
    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;
    }    
    main{
        max-width: 700px;
        margin: auto;
    }
}

/* dator */
@media screen and (min-width: 1000px) {
    header>h1,header>h2{
        background-color:aqua;
    }
    nav>ul {
        flex-direction: row;
    }

}