JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header-wrapper">
      //Mark up for header with drop-down.
 </div>


 <div id="slideshow-carousel" class="center">               
Second div
 </div>

CSS

.header-wrapper {
background: url("../img/new_images/bg.png") repeat-x scroll 0 0 rgba(0, 0, 0, 0);
z-index: 60001;     
width: 100%;
height: 77px;
margin: 0 auto; 
}


 .center
{
    display: block;
    margin: 0px auto;
    width:960px;
    text-align: center;
}