html,body{margin: 0px; padding: 0px;}
div, textarea{box-sizing:border-box;}
#gnb{width: 100%;height: 50px;border-bottom: 1px solid #ccc;}
.logo{width: 150px;text-align:center;line-height: 50px;margin:0  auto} 
#content{padding: 20px;}
.tarea{width:calc(100% - 1px);height: 500px;box-shadow:0 1px 2px #b6b6b6;background:#EDEBDF;border:1px #ccc;font-size:26px;padding:20px;margin-top:10px;}
#footer{text-align:center;font-size:12px;color:#666;}