<!-- divで、progressとprogress-barの組み合わせで実装する -->
<!-- 進捗度は、aria-valuenowの値を変える -->
<div class="progress mb-3">
<div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar" style="width: 20%" role="progressbar" aria-valuenow="25" aria-valuemin="0"
aria-valuemax="100"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar w-50" role="progressbar" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress mb-3">
<div class="progress-bar" style="width: 80%" role="progressbar" aria-valuenow="75" aria-valuemin="0"
aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar w-100" role="progressbar" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
</div>