#topbar {
    border-right: solid 1px black;
    border-bottom: solid 1px black;
    border-left: solid 1px black;

    display: flex;
    justify-content: space-between;
}

#user-menu-list {
    display: none;
    flex-direction: column;
    position: absolute;
    background: white;
}

#user-menu {
    width: 6em;
}

#user-menu:focus-within #user-menu-list {
    display: flex;
}