This example shows how to set the width of accordion to a percentage of its parent container.
<div class="easyui-accordion" style="width:100%;height:180px;">
<div title="About" data-options="iconCls:'icon-ok'" style="overflow:auto;padding:10px;">
<p>width: 100%</p>
</div>
<div title="Help" data-options="iconCls:'icon-help',href:'_content.html'" style="padding:10px;">
</div>
</div>
<div class="easyui-accordion" style="width:50%;height:180px;">
<div title="About" data-options="iconCls:'icon-ok'" style="overflow:auto;padding:10px;">
<p>width: 50%</p>
</div>
<div title="Help" data-options="iconCls:'icon-help',href:'_content.html'" style="padding:10px;">
</div>
</div>