@media (max-width:50rem) {
    body {
        display: grid;
        grid-template-columns: 1fr 4fr;
        grid-template-rows: 1fr auto 1fr;
        gap: 1rem;
    }

    header {
        grid-column: 1 / 3;
        grid-row: 1;
    }

    aside {
        grid-column: 1;
        grid-row: 2;
    }

    aside.rechts {
        display: none;
    }

    main {
        grid-column: 2;
        grid-row: 2;
    }

    footer {
        grid-column: 1 / 3;
        grid-row: 3;
    }
}

@media (min-width:50rem) {
    body {
        display: grid;
        grid-template-columns: 1fr 3fr 1fr;
        grid-template-rows: 1fr auto 1fr;
        gap: 0.5rem;
    }

    header {
        grid-column: 1 / 4;
        grid-row: 1;
    }

    aside {
        grid-column: 1;
        grid-row: 2;
    }

    aside.rechts {
        grid-column: 3;
        grid-row: 2;
    }

    main {
        grid-column: 2;
        grid-row: 2;
    }

    footer {
        grid-column: 1 / 4;
        grid-row: 3;
    }
}

body {
    background-color: gainsboro;
    font-family: Verdana, Arial, sans-serif;
}

footer,
header {
    background-color: lightgrey;
    clear: both;
    padding: 0.5rem;
    border-style: solid;
    border-radius: 1rem;
    border-width: 0px;
    position: relative;
    box-shadow: 0 0 5px lightgrey, 0 0 5px lightgrey;

}

aside,
aside.rechts {
    background-color: gainsboro;
    clear: both;
    padding: 0.5rem;
    border-style: solid;
    border-radius: 1rem;
    border-width: 0px;
    position: relative;
    box-shadow: 0 0 5px gainsboro, 0 0 5px gainsboro;
}

footer {
    display: grid;
    grid-auto-flow: column;
    padding-top: 0;
    padding-bottom: 0;
}

footer div {
    margin-top: auto;
    margin-bottom: auto;
}

img.logo_top_right {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    z-index: 10;
}

main {
    background-color: gainsboro;
    clear: both;
    padding: 0.5rem;
    border-style: solid;
    border-radius: 1rem;
    border-width: 0px;
    box-shadow: 0 0 5px gainsboro, 0 0 5px gainsboro;
}


a.modelle_link {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 1.2rem;
    text-decoration: none;
    font-weight: bold;
    color: blue;
    transition: ease-in-out;
    transition-duration: 0.3s;
}

a.modelle_link:hover {
    text-shadow: 0.1rem 0.1rem 0.2rem rgb(85, 133, 153);
    transition: ease-in-out;
    transition-duration: 0.3s;
}

@media (min-width: 80rem) {
    a.modelle_link::before {
        content: url(../logo/logoneu_40x40.png);
        display: inline;
    }
}

@media (max-width: 80rem) {
    div.modelle_link {
        margin: 5px;
        background-color: rgb(230, 230, 230);
        clear: both;
        padding: 0.5rem;
        border-style: solid;
        border-radius: 1rem;
        border-width: 0px;
        box-shadow: 0px 0px 5px inset lightgrey;
    }
}

a.carts_link {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 1.2rem;
    text-decoration: none;
    color: blue;
    transition: ease-in-out;
    transition-duration: 0.3s;
}

a.carts_link:hover {
    text-shadow: 0.1rem 0.1rem 0.2rem rgb(85, 133, 153);
    transition: ease-in-out;
    transition-duration: 0.3s;
}

a.impressum_link {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 0.8rem;
    text-decoration: none;
    color: navy;
    transition: ease-in-out;
    transition-duration: 0.3s;
}

a.impressum_link:hover {
    text-shadow: 0.1rem 0.1rem 0.2rem rgb(73, 91, 133);
    transition: ease-in-out;
    transition-duration: 0.3s;
}

aside>div {
    position: sticky;
    top: 0;
    bottom: 0;
}