div.historyBox
{
 float: left;
 width: 720px;
 margin-top: 5px;
 margin-bottom: 0px; 
 padding: 0px;
 border: solid 0px black;
}

h3.hb_year
{
 text-align: right;
 float: left;
 width: 95px;
 margin: 0px;
}

p.hb_description
{
 margin-bottom: 0px;
 margin-top: 1px;
 border: solid 0px green;
 float: right;
 padding-left: 10px;
 border-left: solid 1px #ccc;
 width: 605px; /* remember: width + padding + border + margin (probably) = total width */
}

h2
{
 margin-top: 0px;
}