JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <div class="t">Lvl 0-1</div>
    <div class="c">
        <div>Lvl 1-1</div>
        <div class="t">Lvl 1-1</div>
        <div class="c">
            <div>Lvl 2-1</div>
            <div>Lvl 2-1</div>
            <div>Lvl 2-1</div>
        </div>
        <div>Lvl 1-1</div>
    </div>
    <div class="t">Lvl 0-2</div>
    <div class="c">
        <div>Lvl 1-2</div>
        <div class="t">Lvl 1-2</div>
        <div class="c">
            <div>Lvl 2-2</div>
            <div>Lvl 2-2</div>
            <div>Lvl 2-2</div>
        </div>
        <div>Lvl 1-2</div>
    </div>
</nav>

CSS

nav {
    position: relative;
}
div {
    padding: 3px 5px;
}
.t {
    position: relative;
    cursor: pointer;
}
.c {
    position: absolute;
    display: none;
    left: 0;
    width: 200px;
    background: #f0f0f0;
}
.t:hover + .c, .t:focus + .c, .c:hover {
    display: block;
}
.t {
    display: inline-block;
}
.t .t {
    display: block;
    width: 200px;
}
.c .c {
    position: relative;
    background: #e0e0e0;
}
.c .t {
    width: 200px;
}
/* helper to visualize things */
.t:hover {
    background: #eee;
    outline: 1px dotted red;
}