#calculator {}
#calculator input { text-align: right; width: 100px; }
#calculator table { margin-right: auto; margin-left: auto; }
#calculator #calc_button_td { text-align: center; }
#calculator #calc_button { text-align: center; width: auto; margin-top: 5px; }
#calculator #calc_form { width: 40%; float: left; border: 1px dashed #aaa; background-color: #f6f6f6; padding: 10px; }
#calculator #calc_message { float: right; width: 55%; }