<style>
li {
width: 100px;
height: 100px;
overflow: hidden;
border-radius: 50%;
}
img{
width: 100%;
height: 100%;
}
</style>
<div style="">
<ul>
<li class="img">
<img src="https://sc02.alicdn.com/kf/H38fc420142eb4b7b8ce33c6ac0357413e.jpg" alt="">
</li>
</ul>
</div>
