■プログレスバー：progress：：プログレスバーの背景 bg-info
<div class="progress mb-3">
<div class="progress-bar bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
</div>
■プログレスバー：progress：：プログレスバーのストライプをアニメーションさせる
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100" style="width: 25%"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped progress-bar-animated bg-success" role="progressbar" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100" style="width: 50%"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped progress-bar-animated bg-info" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100" style="width: 75%"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped progress-bar-animated bg-danger" role="progressbar" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100" style="width: 100%"></div>
</div>
■プログレスバー：progress：：複数のプログレスバーを積み重ねる
<div class="progress">
<div class="progress-bar" role="progressbar" style="width: 15%" aria-valuenow="15" aria-valuemin="0" aria-valuemax="100"></div>
<div class="progress-bar bg-success" role="progressbar" style="width: 30%" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100"></div>
<div class="progress-bar bg-info" role="progressbar" style="width: 20%" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100"></div>
</div>
■プログレスバー：progress：：プログレスバーをストライプにする
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped" role="progressbar" style="width: 10%" aria-valuenow="10" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped bg-success" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped bg-warning" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar progress-bar-striped bg-danger" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
</div>