body { margin: 0; padding: 0; font-size: 12px; font-family: "맑은고딕", "Courier New", Courier, mono; }
.container {
    display: -webkit-flex;
    display: flex;
}
.header {
    height: 30px;
    background: #f2f2f2;
    width: 100%;
}
/** nav **/
nav {
    clear: both;
    width: 200px;
}
.flex-column {
    -webkit-flex: 1;
    flex: 1;
}
/**
* menu
*/
nav ul {
    margin: 0 0 0 10px; padding: 0; list-style: none;
}
nav ul li {
    margin: 0; padding: 0 0 0 0px; list-style: none;
}