div.lefthand 
{
  position:absolute;
  top: 100px;
  left: 200px;
  width:450px;
  height:300px;
  margin-top: -10px; /*set to a negative number 1/2 of your height*/
  margin-left: -175px; /*set to a negative number 1/2 of your width*/
  background-color: #FFF;
}
div.righthand 
{
  position:absolute;
  top: 100px;
  left: 650px;
  width:450px;
  height:300px;
  margin-top: -10px; /*set to a negative number 1/2 of your height*/
  margin-left: -175px; /*set to a negative number 1/2 of your width*/
  background-color: #FFF;
}

div.bottomIncome
{
  position:absolute ;
  left: 20px;
  width:450px;
  height:200px;
  top:90%;
  bottom:10%;
  background-color: #FFF;
  text-align: left;
}

div.bottomExpense
{
  position:absolute ;
   top: 90%;
  left: 650px;
  width:450px;
  height:300px;
  margin-top: -10px; /*set to a negative number 1/2 of your height*/
  margin-left: -175px; /*set to a negative number 1/2 of your width*/
  background-color: #FFF;
  text-align: left;
}