.bang{

  position:fixed;

  top:100px;

  left:50px;

  display:block;

  width:20px;

  height:20px;

  border:1px solid black;

  border-radius:100px;

  background:black;

  box-shadow:0px -80px 0px 10px black;

}

​

.bang::before{

  left:5px;

  transform:rotate(15deg);

}

​

.bang::after{

  left:-5px;

  transform:rotate(-15deg);

}

​

.bang::before,.bang::after

{

  border-radius:100px;

  display:block;

  background:black;

  content:"";

  top:-75px;

  position:absolute;

  width:20px;

  height:60px;  

}