.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;	
}