<div class="card-deck">
    <div class="card text-white bg-primary">
        <div class="card-body">
            <h4 class="card-title">HTML</h4>
        </div>
    </div>
    <div class="card text-white bg-success">
        <div class="card-body">
            <h4 class="card-title">CSS</h4>
        </div>
    </div>
    <div class="card text-white bg-danger">
        <div class="card-body">
            <h4 class="card-title">Bootstrap</h4>
        </div>
    </div>
</div>