I am trying to modify contact form 7 the way I like it. The problem is I cant find right ID tag for that. I have tried adding div id="tags" but that does not work.

HTML Code:
<div class="wpcf7" id="wpcf7-f48-p2-o1">
<form action="/#wpcf7-f48-p2-o1" method="post" class="wpcf7-form">
<div style="display: none;">
<div id="two-colomn">
<div id="left">
<p>
<p>
<div>
<p/>
<div id="right">
<p>
<p>
<span class="wpcf7-form-control-wrap Postal">
<input type="text" name="Postal" value="Postal Code" class="wpcf7-form-control wpcf7-text wpcf7-validates-as-required required" size="40" maxlength="50"/>
</span>
</p>
</div>
<p>
<div id="submit">
<p>
<div class="wpcf7-response-output wpcf7-display-none"/>
</div>
This have worked for one id but I dont understand where other id are

Code:
#wpcf7-f48-p2-o1 {
  margin-bottom:0.94em;
  margin-top:1em;
}
Thanks a lot for your help