Edit in JSFiddle

<div class="block">

 <div class="box">
 
 
 </div>

</div>
.block{
  
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  
}
.box{
  
  width: 60vmin;
  height: 60vmin;
  border: 1px dashed rgba(255, 255, 255, 0.4);
  position: relative;
  background:#000;
  border-radius:59% 41% 65% 36% / 44% 45% 55% 56%;
  
}