header .logo a {
  width: 512px;
  height: 150px;
  display: block;
  text-indent: -9999px;
  /*
   * Set a base background for 1x environments.
   */
  background: url('/images/logo.png') center center no-repeat;
  background-size: 100%;
  
  /*
   * Create an @2x-ish media query.
   */
  /*
   * Create media queries for all environments that the user has
   * provided images for.
   */
}

#content{
	text-align: center;
	
}