[рони]

<style>
li.item-slider-item{
    width: 128px;
    height: 128px;
    background-size:  cover;
    background-repeat: no-repeat;
    list-style: none;
    transition: .4s;
     }

li.item-slider-item:nth-child(1){ background-image:url(https://javascript.ru/cat/list/donkey.gif)}
li.item-slider-item:nth-child(1):hover{ background-image:url(https://javascript.ru/cat/list/firefox.gif)}
li.item-slider-item:nth-child(2){ background-image:url(https://javascript.ru/cat/list/jquery_54.png)}
li.item-slider-item:nth-child(2):hover{ background-image:url(https://javascript.ru/cat/list/js.gif)}
</style>
<ul>
<li class="item-slider-item"></li>
<li class="item-slider-item"></li>
</ul>