you have to paste the below code just after the div #header
closed.
<div class="featured-img-bg">
<a href="http://constantin-entertainment.info/fixitnow/about-us/" title="Permalink to About Us"> <img width="1000" height="390" src="http://constantin-entertainment.info/fixitnow/wp-content/uploads/2014/04/slider.jpg" class="" alt="slider"></a></div>
CSS would be like this..
.featured-img-bg {
background: none repeat scroll 0 0 #E4E4E4 !important;
overflow: hidden;
text-align: center;
/*width: 1349px;*/ /*Not Required*/
}
.featured-img-bg img{float:none} /*Remove the by default added `float:left`*/
Check the screenshot for more clearance.