nav {
    width: 5rem;
    position: absolute;
    overflow: hidden;
    top: 0em;
    right: 0em;
    height: 100%;
}

nav > ul {
    list-style: none;
    padding-left: 5%;
    a>li{
        display: block;
        min-height: 8em;
    }
    a :hover {
        background-color: aqua;
    }
}

.nv-selected {
    background-color: blue;
}