<!DOCTYPE html>
<html>
<head>
    <title>CSS Grid, display: contents &amp; ::before/::after</title>
    <style>
        .grid {
            display: grid;
            grid-template-columns: repeat(5, 150px);
        }

        span {
            width: 100px;
            height: 100px;
            background-color: green;
        }
    </style>
</head>
<body>
    <div class="grid">
        <span>before</span>
        <span>after</span>
        <span>span</span>
        <span>before</span>
        <span>after</span>
    </div>
</body>
</html>