JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.3.0/pure-min.css">
<fieldset id="fields-list">
    <div class="pure-g entry">
        <div class="pure-u-1-5">
            <input type="text" class="pure-input-1" id="input-1" name="input-1">
        </div>
        <div class="pure-u-1-5">
            <input type="text" class="pure-input-1" id="date" name="date">
        </div>
        <div class="pure-u-1-5">
            <input type="text" class="pure-input-1" id="input-2" name="input-2">
        </div>
</fieldset>
<button id="add">Add</button>

JavaScript

$(document).ready(function () {
    $("#add").click(function () {
        $(".entry:first").clone(false).appendTo("#fields-list");
    });
});