Using the pseudo selector :after, you can add an element after each h1:
h1 {
padding-bottom: 0.5em;
margin-bottom: 50px;
border-bottom: 1px solid green;
display: inline-block;
position: relative;
}
h1:after {
position: absolute;
left: 50%;
margin-left: -15px;
display: block;
content: '';
width: 20px;
height: 20px;
background: green;
border: 10px solid white;
}
, , , . - :after, - ( h1, ) ( h1:after).
http://jsfiddle.net/stevemchey/YFXGa/