<div id="additional_info_1" style="width:18%;box-sizing:border-box; float:left ;text-align:center;border:1px solid red;margin:1px">부가정보1</div> <div id="main_info" style="width:60%;box-sizing:border-box; float:left ;text-align:center;;border:1px solid red;margin:1px">메인 정보</div> <div id="additional_info_2" style="width:18%;box-sizing:border-box; float:left ;text-align:center;;border:1px solid red;margin:1px">부가정보2</div>