如何让两个div并排，并且div要看得见边框

<div style="float:left; width:100px; height:100px; border:2px solid #0000FF;"></div><div style="float:left; width:300px; height:100px; border-right:2px solid #0000FF; border-top:2px solid #0000FF; border-bottom:2px solid #0000FF;"></div>