 <div id="unavailableProgressBar" class="progress-bar" role="progressbar" style="" aria-valuenow="0" aria-valuemin="0"
                 aria-valuemax="100">
                <div class="label"></div>
            </div>
        </div>
        <div id="unavailableProgressText" style="width: 100%;text-align: center;">Idle</div>
        <br>
    </div>
    <label for="unavailable-columns">Select column(s)</label>
    <select id="unavailable-columns" multiple="multiple" hidden></select>
</div>
<div class="contain