#grid-container {
    display: grid;
    margin: auto;
    width: 800px;
    grid-template-columns: 200px 400px 200px;
    grid-template-areas:
    'header header aside'
    'section article aside'
    'footer footer footer';
    border: black solid 1px;
}

#grid-container header {
    grid-area: header;
    background-color: tomato;
    border: black solid 1px;
    text-align: center;
    color: white;
}

#grid-container section {
    padding: 20px;
}

#grid-container .section2 {
    grid-area: section;
    background-color: lime  ;
    border: black solid 1px;
}

#grid-container aside {
    grid-area: aside;
    background-color: yellow;
    border: black solid 1px;
    text-align: center;
}

#grid-container article {
    grid-area: article;
    background-color: lightgrey;
    border: black solid 1px;
}

#grid-container footer {
    grid-area: footer;
    background-color: grey;
    border: black solid 1px;
    text-align: center;
}

#grid-container nav {
    background-color: white;
    margin: auto;
    width: 150px;
    border: black solid 2px;
    padding: 4px;
}

#grid-container img {
    border: black solid 2px;
}

#grid-container .banan {
    padding: 20px;
}

#grid-container .reklam {
    background-color: white;
    border: red solid 2px;
    margin: 40px;
    width: 125px;
    text-align: center;
}

#grid-container .bold  {
    font-weight: bold;
    font-size: 50px;
}

nav a:hover {
    background-color: greenyellow;
    transform: scale(1.02);
}

nav a {
    display: block;
    padding: 10px;
    border: solid black 2px;
    color: black;
    text-decoration: none;
    border-collapse: collapse;
}

#current {
    background-color: orangered;
    font-weight: bolder;
}

/*Ny css*/

* {
    box-sizing: border-box;
}

#grid-container::after {
    content: "";
    clear: both;
    display: block;
}

@media only screen and (max-width: 768px) {
    #grid-container aside {
        display: none;
    }
}

@media only screen and (max-width: 600px) {
    #grid-container {
        grid-template-columns: 100%;
        grid-template-areas:
            'header'
            'section'
            'article'
            'footer';
    }

    #grid-container {
        width: 100%;
        float: left;
    }

    #grid-container aside {
        display: none;
    }

    #grid-container header,
    #grid-container section,
    #grid-container article,
    #grid-container footer {
        width: 100%;
        float: left;
        clear: both;
    }

    #grid-container nav a {
        display: block;
        width: 100%;
    }

    #grid-container .bold {
        font-size: 30px;
    }
}