레이아웃만들떄..줄닫는법좀알려주세요 기초인지알겟는데 모르겟어요 ㅠ

<div>    <div style="border:1px solid #000;width:80%;height:50px;margin:1px;">상단</div>    <div style="margin:1px;width:80%">        <div style="border:1px solid #000;width:30%;height:300px;float:left;margin:1px;">왼쪽</div>        <div style="width:69%;height:300px;float:right;margin:1px;">            <div style="position:relative">                <div style="border:1px solid #000;width:69%;height:100px;float:left;margin:1px;">1</div>                <div style="border:1px solid #000;width:69%;height:100px;float:left;margin:1px;">2</div>                <div style="border:1px solid #000;width:30%;height:200px;right:0;margin:1px;position:absolute">오른쪽</div>            </div>            <div style="border:1px solid #000;width:100%;height:100px;float:left;margin:1px;">하단</div>        </div>    </div></div>