*{
    box-sizing: border-box;
    margin: 0px;
    padding: 0px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body{
    width: 100vw;
    height: 100vh;
    padding: 10px;
    background-color: lightgray;
}

.content {
    width: 100%;
    height: 100%;
    background-color: aliceblue;
    padding: 5px;

    display: grid;
    grid-template-columns: 200px 1fr;
    grid-template-rows: 1fr;
    grid-template-areas: "nav main";
}
aside{
    grid-area: nav;
    background-color: lightblue;
}
main{
    grid-area: main;
    height: 100%;
    background-color: lightsteelblue;

    overflow: hidden;
}

section{
    overflow-x: auto;
    height: 100%;
}
article{
    /* width: max-content; */
    height: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    column-count: auto;
    column-width: 20vw;
}

article p{
    padding-right: 15px;
}
@media screen and (max-width:800px) {
    .content {
        width: 100%;
        height: 100%;
        background-color: aliceblue;
        padding: 5px;
    
        display: grid;
        grid-template-columns: 1fr;
        grid-template-rows: 30px 1fr;
        grid-template-areas: "nav" "main";
    }
}