body,html{
    height:100%;
}
#triangle{
    margin-left:150px;
	width: 0; 
	height: 0; 
	border-left: 100px solid transparent;
	border-right: 100px solid transparent;
	
	border-bottom: 172px solid grey;
}
#node{
    position:absolute;
    width:10px;
    height:10px;
    border-radius:100%;
    background:red;
}