<!DOCTYPE html>
<title>CSS Grid Layout Examples</title>
<style>
    .grid {
        display: inline-grid;
        border: 0.1em solid;
        border-radius: 0.2em;
        font-size: 2em;
    }

    .grid > div {
        margin: 0.05em;
        border-width: 0.1em;
        border-style: solid;
        border-radius: 0.2em;
        padding: 0.5em;
        font-family: monospace;
    }

    .item-1 {
        background-color: rgba(242, 46, 138, 0.8);
        border-color: rgb(242, 46, 138);
    }

    .item-2 {
        background-color: rgba(98, 205, 217, 0.8);
        border-color: rgb(98, 205, 217);
    }

    .item-3 {
        background-color: rgba(117, 191, 6 , 0.8);
        border-color: rgb(117, 191, 6);
    }

    .item-4 {
        background-color: rgba(242, 226, 5, 0.8);
        border-color: rgb(242, 226, 5);
    }

    html, body {
        height: 100%;
        padding: 0;
        margin: 0;
    }

    .responsive {
        display: grid;
        height: 100%;
        box-sizing: border-box;
        grid-gap: 10px 20px;
        grid-template-rows: 100px 1fr auto;
        grid-template-columns: 1fr 200px;
        grid-template-areas: "header  header"
                             "content aside "
                             "footer  aside ";
    }

    .header {
        grid-area: header;
    }

    .content {
        grid-area: content;
    }

    .aside {
        grid-area: aside;
    }

    .footer {
        grid-area: footer;
    }

    @media (max-width: 600px) {
        .responsive {
            grid-gap: 0;
            grid-template-rows: auto 1fr auto auto;
            grid-template-columns: 1fr;
            grid-template-areas: "header "
                                 "content"
                                 "aside  "
                                 "footer ";
        }
    }
</style>

<div class="grid responsive">
    <div class="item-1 header">Header</div>
    <div class="item-2 content">Content</div>
    <div class="item-3 aside">Aside</div>
    <div class="item-4 footer">Footer</div>
</div>