Bootstrap CSS class .gx-md-0

    <div class="container">
        <div class="row gy-1 gx-1 gx-md-0">
            <div class="col-6">
                <div class="p-4 border bg-info"></div>
            </div>
            <div class="col-6">
                <div class="p-4 border bg-primary"></div>
            </div>
            <div class="col-6">
                <div class="p-4 border bg-success"></div>
            </div>
            <div class="col-6">
                <div class="p-4 border bg-secondary"></div>
            </div>
        </div>
    </div>