JSFiddle - React, Tailwind, and code Playground

by riaanc

HTML

<ul>
    <li><div>Level 1</div></li>
    <li><div>Level 1</div>
        <ul>
            <li><div>Level 2</div></li>
            <li><div>Level 2</div>
                <ul>
                    <li><div>Level 3</div></li>
                    <li><div>Level 3</div></li>
                    <li><div>Level 3</div>
                    <ul>
                    <li><div>Level 3</div></li>
                    <li><div>Level 3</div></li>
                    <li><div>Level 3</div></li>
                </ul>
                    </li>
                </ul>
            </li>
            <li><div>Level 2</div>
        </ul>
        <li><div>Level 2</div>
    </li>
    <li><div>Level 1</div></li>
</ul>

CSS

ul {
    padding: 0;
    margin: 0;
    list-style-type: none;
    position: relative;
}

li {
    list-style-type: none;
    border-left: 2px solid #000;
    margin-left: 1em;
}

li div {
    padding-left: 1em;
    position: relative;
}

li div::before {
    content: '';
    position: absolute;
    top: 0;
    left: -2px;
    bottom: 50%;
    width: 0.75em;
    border: 2px solid #000;
    border-top: 0 none transparent;
    border-right: 0 none transparent;
}

ul > li:last-child {
    border-left: 2px solid transparent;
}