只需添加margin:auto
到行标签<div class="row" style="margin:auto">
如下:https : //jsfiddle.net/01rewj56/1/
<div class="container">
<div class="row">
<div class="col-12">
<table class="table table-borderless table-condensed mt-5">
<thead>
<tr>
<th style="text-align:center;">Reference Genome</th>
<th style="text-align:center;">Annovar version</th>
<th style="text-align:center;"></th>
</tr>
</thead>
<tbody>
<tr>
<td>
<select class="form-control" name="referenceGenomeSelect">
<option value="1">hg19</option>
<option value="2">hg38</option>
</select>
</td>
<td>
<div class="form-inline">
<div class="row" style="margin:auto"> <!-- added margin auto -->
<div class="col">
<input type="text" id="annovarVersion" class="form-control" placeholder="Please select a file...">
</div>
<div class="col">
<button class="btn btn-secondary" onclick="document.getElementById('annovarVersionInput').click()">Browse</button>
<input type='file' id="annovarVersionInput" style="display:none" onchange='updateInputText(this.value, -1)'>
</div>
</div>
</div>
</td>
<td>
<button type="submit" class="btn btn-primary" >Save</button>
<button type="submit" class="btn btn-secondary" >Cancel</button>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
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