CSS
#owl-demo .item{
  margin: 3px;
}
#owl-demo .item img{
  display: block;
  width: 100%;
  height: auto;
}
HTML
<div id="demo">
	<div class="container">
		<div class="span">
			<div id="owl-demo">

			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>
			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>
			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>
			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>
			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>
			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>
			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>
			  <div class="item"><img src="http://placehold.it/350x180" alt="Owl Image"></div>

			</div>
		</div>
	</div>
</div>
JS
  $("#owl-demo").owlCarousel({

      autoPlay: 3000, //Set AutoPlay to 3 seconds

      items : 4,
      itemsDesktop : [1199,3],
      itemsDesktopSmall : [979,3]

  });