body { background: #007; }
body, html {width: 100%; height: 100%; margin: 0; padding: 0}
.naver a { background: #444; border-right: 1px solid white; color: #fff; display: block; float: left; font-size: 12px; line-height: 20px; margin: 0 1px 0 0; padding: 0 10px; cursor:hand;}
.naver a:hover { background: #222; }
.naver.enabled a { float: left; margin: 0 0 1px 0; width: 33%; }
.row-container {display: table; empty-cells: show; border-collapse: collapse; width: 100%; height: 100%;}
.first-row {display: table-row; overflow: auto; background-color: #007;}
.second-row {display: table-row; height: 100%; background-color: #FFF; overflow: hidden }
.second-row iframe {width: 100%; height: 100%; border: none; margin: 0; padding: 0; display: block;}