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Bootstrap class: .flex-xl-fill

    <div class="d-flex bg-secondary p-1">
        <div class="p-3 flex-xl-fill bg-primary">1</div>
        <div class="p-3 bg-info">2</div>
        <div class="p-3 bg-primary">3</div>
        <div class="p-3 bg-info">4</div>
    </div>

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More in Bootstrap Flexbox

Bootstrap 4 & 5