How to change the Align of the WYSIWYG Editor

[PLi]

I have a vBulletin V3.6.8 and the problem, that the WYSIWYG Editor is centered (I don't know the reason, possibly default setting)
Attachment 82262

I'm wondering what i will have to change to set the Align of the WYSIWYG-Editor to left by editing a CSS Style or template of my custom style (modified Original-vBulletin-Style).

In the sourcecode of the website the possible reason is this part:

<!-- END TEMPLATE: navbar -->



<form action="newthread.php?do=postthread&amp;f=2" method="post" name="vbform" onsubmit="return vB_Editor['vB_Editor_001'].prepare_submit(this.subject.value, 0)">

<table class="tborder" cellpadding="6" cellspacing="1" border="0" width="100%" align="center">
<tr>
<td class="tcat">
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</td>
</tr>
<tr>
<td class="panelsurround" align="center">
<div class="panel">
<div style="width:500px" align="left">

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I don't find a solution by the search function of this forum

Who is able to help?