我可以点击按钮来显示图像，但不能将它们带走

Question

我正在尝试从引导程序制作一些基本面板，但第二个面板的主体比第一个面板短，当我尝试增加面板2的高度它不会让我，但它会让我减少高度，所以我的问题是，如何增加面板2上的身体高度。

<div class="panel panel-primary" id="panel1" style="width: 15%";>
      <div class="panel-heading">Image Split</div>
      <div class="panel-body">An image split into difference sections with different links</div>
      <div class="panel-footer panel-primary" id="footer1">
          <button onclick="window.location.href='imagesplit.html'" class="btn btn-primary" id="btn">CLICK HERE</button>
      </div>
</div> 

<div class="panel panel-primary" id="panel2" style="width: 15%";>
      <div class="panel-heading">Boolean</div>
      <div class="panel-body" style="max-height: 100";>A simple addition example of boolean</div>
      <div class="panel-footer panel-primary" id="footer1">
          <button onclick="window.location.href='boolean.html'" class="btn btn-primary" id="btn">CLICK HERE</button>
      </div>
</div>