cloudy box

<style>
.cloudybox {
  height: 140px;
  width: 200px;
  border: 10px solid transparent;
}
.cloudyfull { width:100%; height:100%; overflow-y:auto; background:#fff;}
.cloudybox { border-image: url(https://i.postimg.cc/QM9dMFhq/cloud.png) 50 round; }
</style>
<div class="cloudybox"><div class="cloudyfull">STUFF HERE</div></div>