JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<ul class="select" data-placeholder="Role" data-name="role">
  <li data-value="admin">Administrator</li>
  <li data-value="mod">Moderator</li>
  <li data-value="user">User</li>
</ul>

CSS

.li-select-container {
    width: 200px;
    display: table;
    position: relative;
    margin: .5em 0;
    font-family: sans-serif;
    font-size: 1em;
}

.li-select-container input {
    background-color: white;
    width: 100%;
    padding: 2px 5px;
    box-sizing: border-box;
    border: 1px solid hsl(0, 0%, 60%);
    user-select: none;
    -webkit-user-select: none;
    cursor: default;
    font-size: inherit;
}
.li-select-container input.placeholder {
    color: rgba(0,0,0,.5);
}
.li-select-container input:focus {
    border: 1px solid hsl(210, 100%, 56%);
    box-shadow: 0 0 1px hsl(210, 100%, 56%, .5);
}

.li-select-container .arrow {
    font-size: .7em;
    opacity: 0.75;
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    user-select: none;
    cursor: default;
}
.li-select-container:hover input:not(:focus) {
    border: 1px solid hsla(0, 0%, 30%);
}
.li-select-container:hover .arrow {
    opacity: 1;
}

.li-select-container ul {
    background-color: white;
    border: 1px solid hsl(0, 0%, 60%);
    border-top: none;
    user-select: none;
    display: none;
    position: absolute;
    width: 100%;
    z-index: 999;
    box-sizing: border-box;
    padding: 0;
    list-style: none;
    margin: 0;
}
.li-select-container.visible ul {
    display: block;
}
.li-select-container ul li {
    padding: 2px 5px;
    cursor: default;
}
.li-select-container ul li.placeholder {
    opacity: 0.5;
}
.li-select-container ul li.hover {
    background-color: dodgerblue;
    color: white;
}
.li-select-container ul li.placeholder.hover {
    background-color: rgba(0,0,0,.1);
    color: initial;
}

JavaScript

// helper function to create elements faster/easier
// https://github.com/akinuri/js-lib/blob/master/element.js
var elem = function (tagName, attributes, children, isHTML) {
    let parent;
    if (typeof tagName == "string") {
        parent = document.createElement(tagName);
    } else if (tagName instanceof HTMLElement) {
        parent = tagName;
    }
    if (attributes) {
        for (let attribute in attributes) {
            parent.setAttribute(attribute, attributes[attribute]);
        }
    }
    var isHTML = isHTML || null;
    if (children || children == 0) {
        elem.append(parent, children, isHTML);
    }
    return parent;
};
elem.append = function (parent, children, isHTML) {
    if (parent instanceof HTMLTextAreaElement || parent instanceof HTMLInputElement) {
        if (children instanceof Text || typeof children == "string" || typeof children == "number") {
            parent.value = children;
        }
        else if (children instanceof Array) {
            children.forEach(function (child) {
                elem.append(parent, child);
            });
        }
        else if (typeof children == "function") {
            elem.append(parent, children());
        }
    } else {
        if (children instanceof HTMLElement || children instanceof Text) {
            parent.appendChild(children);
        }
        else if (typeof children == "string" || typeof children == "number") {
            if (isHTML) {
                parent.innerHTML += children;
            } else {
                parent.appendChild(document.createTextNode(children));
            }
        }
        else if (children instanceof Array) {
            children.forEach(function (child) {
                elem.append(parent, child);
            });
        }
        else if (typeof children == "function") {
            elem.append(parent, children());
        }
    }
};



// ============================== HELPER FUNCTIONS

HTMLElement.prototype.getIndex = function () {
...