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Bootstrap class: .gap-sm-0

    <div class="d-grid gap-1 gap-sm-0">
        <div class="p-2 border bg-info text-white">Grid element</div>
        <div class="p-2 border bg-primary text-white">Grid element</div>
        <div class="p-2 border bg-success text-white">Grid element</div>
    </div>

Preview

Grid element
Grid element
Grid element

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More in Bootstrap Grid

Bootstrap 4 & 5