JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://brianreavis.github.io/selectize.js/css/selectize.bootstrap3.css">
<script src="http://brianreavis.github.io/selectize.js/js/selectize.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<select id="test" placeholder="Choose a language...">
    <option value=""></option>
    <option value="javascript">Javascript</option>
    <option value="ruby">Ruby</option>
    <option value="python">Python</option>
</select>

CSS

@import url(http://fonts.googleapis.com/css?family=Questrial);
 @import url(http://weloveiconfonts.com/api/?family=zocial);

/* zocial */
[class*="zocial-"]:before {
    font-family:'zocial', sans-serif;
}
* {
    font-family: Questrial !important;
}
body {
    padding: 40px;
    background: white;
}

JavaScript

Selectize.define('selectable_placeholder', function (options) {
    var self = this;

    options = $.extend({
        placeholder: self.settings.placeholder,
        html: function (data) {
            return (
                '<div class="selectize-dropdown-content placeholder-container">' +
                '<div data-selectable class="option">' + data.placeholder + '</div>' +
                '</div>');
        }
    }, options);

    // override the setup method to add an extra "click" handler
    self.setup = (function () {
        var original = self.setup;
        return function () {
            original.apply(this, arguments);
            self.$placeholder_container = $(options.html(options));
            self.$dropdown.prepend(self.$placeholder_container);
            self.$dropdown.on('click', '.placeholder-container', function () {
                self.setValue('');
                self.close();
                self.blur();
            });
        };
    })();

});

$('#test').selectize({
    create: false,
    dropdownParent: 'body',
    plugins: {
        'selectable_placeholder': {}
    }
});