Add height to div="owl-wrapper-outer" so you can use diffrent heights on each slide. Use it only for one item per page setting. Don't use it on large content websites.
$(document).ready(function() {
$("#owl-demo").owlCarousel({
autoPlay : 3000,
stopOnHover : true,
navigation:true,
paginationSpeed : 1000,
goToFirstSpeed : 2000,
singleItem : true,
autoHeight : true,
transitionStyle:"fade"
});
});
<div id="owl-demo" class="owl-carousel"> <div><img src="https://placehold.it/1170x300/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x400/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x500/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x200/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x500/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x250/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x350/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x300/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x100/42bdc2/FFFFFF"></div> <div><img src="https://placehold.it/1170x500/42bdc2/FFFFFF"></div> </div>
#owl-demo .owl-item div{
padding:5px;
}
#owl-demo .owl-item img{
display: block;
width: 100%;
height: auto;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;
}