<!DOCTYPE HTML>
<html>
    <body>
        <fieldset style="overflow:hidden; width:200px; height:200px;">
            <legend>Legend</legend>
            <div style="display:grid; grid-template-columns: repeat(4,50px); grid-auto-rows: 20px;">
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
            </div>
        </fieldset>
        <fieldset>
            <legend>Legend</legend>
            <div style="display:grid; grid-auto-columns: 50px; grid-auto-rows: 20px;">
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
                <p>X
            </div>
        </fieldset>
    </body>
</html>