Business Directory Theme and remove search style 2 background

Hi There,

I am using the search style 2 for the Home Page of my Business Directory Theme, and I want to know how I can remove the gray background shown behind the search box and image.

I am sharing the search style 2 code. What changes should I make in order to remove the gray line?

<div class=”wlt_object_search_2″>
<div class=”container”>
<div class=”row”>
<div class=”col-md-8″></div>
<div class=”col-md-4″>
<div class=”panel panel-default”>
<div class=”panel-body”>
<h3>Website Search</h3>
Search our webiste listings below;
<div class=”row”>[ADVANCEDSEARCH home=yes]</div>
</div>
</div>
</div>
</div>
</div>
</div>