body { margin: 0; font-family: 'Malgun Gothic'; }

/* TOP */
.top-header {
  height: 50px;
  background: #1e90ff;
  color: #fff;
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-header nav a {
  color: #fff;
  margin-left: 15px;
  cursor: pointer;
  text-decoration: none;
}

/* BODY */
.layout-body {
  display: flex;
  height: calc(100vh - 50px);
}

/* LEFT MENU */
.left-menu {
  width: 220px;
  background: #2f3640;
  color: #fff;
  overflow-y: auto;
  padding: 10px;
}

/* MAIN */
.main-area {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  background: #f5f6fa;
}