Setting Bootstrap buttons to the same width

Question

I have a bootstrap sidebar that contains a couple buttons. Unfortunately, it looks very ugly and I want each button to be the same size. These buttons are contained in a sidebar and will be stack vertically. I want to avoid setting a pixel number for each button.
Here is the jfiddle
https://jsfiddle.net/66bk2rfc/

HTML

<div id="reading-sidebar" class="col-xs-3 panel-default">
  <div id="reading-sidebar-title" class="panel-heading">Options
    <button type="button" class="btn btn-xs btn-default pull-right" id="reading-sidebar-hide-btn"><i class="glyphicon glyphicon-remove"></i></button>
      </div>
      <div id="reading-sidebar-contents" class="panel-body">
        <ul class="sidebar-button-list">
          <button type="button" id="pre-reading-btn" class="btn btn-default pull-left"><i class="glyphicon glyphicon-minus"></i>&nbsp;Pre Readings</button><br>
          <button type="button" id="passage-btn" class="btn btn-default pull-left"><i class="glyphicon glyphicon-minus"></i>&nbsp;Passage</button><br>
          <button type="button" id="post-reading-btn" class="btn btn-default pull-left"><i class="glyphicon glyphicon-minus"></i>&nbsp;Post Readings</button><br>
          <button type="button" id="media-btn" class="btn btn-default pull-left"><i class="glyphicon glyphicon-minus"></i>&nbsp;Media</button><br>
          <button type="button" id="question-btn" class="btn btn-default pull-left"><i class="glyphicon glyphicon-minus"></i>&nbsp;Questions</button>
        </ul>
      </div>
    </div> 

Answer 1

The "bootstrap" way to do this would be to use btn-block on your button elements. Like so:

<button type="button" class="btn btn-primary btn-lg btn-block">Full-width Button</button>

Answer 2

You can also just surround them with <div class="btn-group-lg btn-group-vertical">

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<div id="reading-container" class="col-xs-6">
  <div id="reading-sidebar" class="col-xs-3 panel-default"></div>
  <div id="reading-sidebar-contents" class="panel-body">
    <div class="btn-group-lg btn-group-vertical">
      <button type="button" id="pre-reading-btn" class="btn btn-default"><i class="glyphicon glyphicon-minus"></i>&nbsp;Pre Readings</button>
      <button type="button" id="passage-btn" class="btn btn-default"><i class="glyphicon glyphicon-minus"></i>&nbsp;Passage</button>
      <button type="button" id="post-reading-btn" class="btn btn-default"><i class="glyphicon glyphicon-minus"></i>&nbsp;Post Readings</button>
      <button type="button" id="media-btn" class="btn btn-default"><i class="glyphicon glyphicon-minus"></i>&nbsp;Media</button>
      <button type="button" id="question-btn" class="btn btn-default"><i class="glyphicon glyphicon-minus"></i>&nbsp;Questions</button>
    </div>
  </div>
</div>

Answer 3

If I get your question right. Do you mean this:

#reading-sidebar-contents .btn{
    width:200px;
}

Here is fiddle: https://jsfiddle.net/66bk2rfc/6/