JSFiddle - React, Tailwind, and code Playground

HTML

<div class='selectBox'> <span class='selected'></span>
 <span class='selectArrow'>&#9660</span>

    <div class="selectOptions"> <span class="selectOption" value="Option 1">Rob</span>
 <span class="selectOption" value="Option 2">Charles</span>
 <span class="selectOption" value="Option 3">Smith</span>

    </div>
</div>
<div class="overlay"></div>

CSS

div.selectBox {
    position: relative;
    display: inline-block;
    cursor: default;
    text-align: left;
    line-height: 30px;
    clear: both;
    color: #888;
    z-index: 101;
}
span.selected {
    width: 167px;
    text-indent: 20px;
    border: 1px solid #ccc;
    border-right: none;
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
    background: #f6f6f6;
    overflow: hidden;
}
span.selectArrow {
    width: 30px;
    border: 1px solid #60abf8;
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
    text-align: center;
    font-size: 20px;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
    background: #4096ee;
}
span.selectArrow, span.selected {
    position: relative;
    float: left;
    height: 30px;
    z-index: 1;
}
div.selectOptions {
    position: absolute;
    top: 28px;
    left: 0;
    width: 198px;
    border: 1px solid #ccc;
    border-bottom-right-radius: 5px;
    border-bottom-left-radius: 5px;
    overflow: hidden;
    background: #f6f6f6;
    padding-top: 2px;
    display: none;
}
span.selectOption {
    display: block;
    width: 80%;
    line-height: 20px;
    padding: 5px 10%;
}
span.selectOption:hover {
    color: #f6f6f6;
    background: #4096ee;
}
.overlay {
    z-index: 100;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    height: 100%;
    opacity: 0.5;
    background-color: black;
    display: none;
}

JavaScript

$(document).ready(function () {
    enableSelectBoxes();
});

function enableSelectBoxes() {
    $('div.selectBox').each(function () {
        $(this).children('span.selected').html($(this).children('div.selectOptions').children('span.selectOption:first').html());
        $(this).attr('value', $(this).children('div.selectOptions').children('span.selectOption:first').attr('value'));

        $(this).children('span.selected,span.selectArrow').click(function () {
            if ($(this).parent().children('div.selectOptions').css('display') == 'none') {
                $(this).parent().children('div.selectOptions').css('display', 'block');
                $('.overlay').show();
            } else {
                $(this).parent().children('div.selectOptions').css('display', 'none');
            }
        });

        $(this).find('span.selectOption').click(function () {
            $('.selectBox .selectOptions').slideUp();
            $('.overlay').hide();
            $(this).parent().css('display', 'none');
            $(this).closest('div.selectBox').attr('value', $(this).attr('value'));
            $(this).parent().siblings('span.selected').html($(this).html());
        });
    });
} //-->

$('.overlay').bind('click', function () {
    $('.selectBox .selectOptions').slideUp();
    $(this).hide();
});