JSFiddle - React, Tailwind, and code Playground

HTML

<div id="add" onClick="addWindow()">+</div>

CSS

body {
    margin: 0px;
    background: #000;
}
iframe {
    position: absolute;
    top: 0px;
    right: 0px;
    border: 0px;
    width: 100%;
    height: 100%;
}
div {
    width: 300px;
    height: 30px;
    position: absolute;
    right: 0px;
    z-index: 1;
    line-height: 30px;
    font-size: 13px;
    color: #aaaaaa;
    background: linear-gradient(rgb(69, 72, 77) 0%, rgb(0, 0, 0) 100%);
    font-family: Arial;
    font-weight: bold;
    text-align: left;
}
select {
    margin-top: 5px;
    margin-left: 5px;
}
#add {
    width: 30px;
    text-align: center;
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}

JavaScript

var windowCount = 0;
var servers = {
    "North America": {
        "http://us.gw2stuff.com/events/anvil-rock": "Anvil Rock",
            "http://us.gw2stuff.com/events/blackgate": "Blackgate",
            "http://us.gw2stuff.com/events/borlis-pass": "Borlis Pass",
            "http://us.gw2stuff.com/events/crystal-desert": "Crystal Desert",
            "http://us.gw2stuff.com/events/darkhaven": "Darkhaven",
            "http://us.gw2stuff.com/events/devonas-rest": "Devona's Rest",
            "http://us.gw2stuff.com/events/dragonbrand": "Dragonbrand",
            "http://us.gw2stuff.com/events/ehmry-bay": "Ehmry Bay",
            "http://us.gw2stuff.com/events/eredon-terrace": "Eredon Terrace",
            "http://us.gw2stuff.com/events/fergusons-crossing": "Ferguson's Crossing",
            "http://us.gw2stuff.com/events/fort-aspenwood": "Fort Aspenwood",
            "http://us.gw2stuff.com/events/gate-of-madness": "Gate of Madness",
            "http://us.gw2stuff.com/events/henge-of-denravi": "Henge of Denravi",
            "http://us.gw2stuff.com/events/isle-of-janthir": "Isle of Janthir",
            "http://us.gw2stuff.com/events/jade-quarry": "Jade Quarry",
            "http://us.gw2stuff.com/events/kaineng": "Kaineng",
            "http://us.gw2stuff.com/events/maguuma": "Maguuma",
            "http://us.gw2stuff.com/events/northern-shiverpeaks": "Northern Shiverpeaks",
            "http://us.gw2stuff.com/events/sanctum-of-rall": "Sanctum of Rall",
            "http://us.gw2stuff.com/events/sea-of-sorrows": "Sea of Sorrows",
            "http://us.gw2stuff.com/events/sorrows-furnace": "Sorrow's Furnace",
            "http://us.gw2stuff.com/events/stormbluff-isle": "Stormbluff Isle",
            "http://us.gw2stuff.com/events/tarnished-coast": "Tarnished Coast",
            "http://us.gw2stuff.com/events/yaks-bend": "Yak's Bend",
    },
        "Europe": {
        "http://v2.gw2stuff.com/events/aurora-glade": "Aurora Glade",
           ...