CSS and HTML for a rounded black box

black box rounded edge.html

<div id="id" class="blackbox" >
    <div class="open">
        <img class="shadowfilter" src="pic.png" > 
    </div>
</div>


=====================
<style>
.blackbox {
    background: rgb(0, 0, 0);
    border-radius: 10px;
    width: 80px;
    height: 70px;
    line-height: 60px;
    display: block;
    margin: auto;
    text-align: center;
    padding: 20px;
    margin: 3px;
    box-shadow: 0 0 5px #000;
}

.shadowfilter{
  text-align: center;
  vertical-align: middle;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}
</style>