.main_wrapper {
    padding: 20px;
    display: flex;
    flex-flow: column nowrap;
    height: 100%;
}

.nav_wrapper {
    display: flex;
    flex-flow: row nowrap;
}

.menu__subwrap {
    display: flex;
}

.nav_wrapper {
    display: flex;
    flex-flow: row nowrap;
    flex: 0 0 auto;
    width: 100%;
}

.content_wrapper {
    flex: 0 0 auto;
}