JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
<link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
<div class="bgplay">
        <div class="nota_vermelha_cair"></div>
        <div class="nota_roxa_cair"></div>
        <div class="nota_verde_cair"></div>
        <div class="nota_azul_cair"></div>
        <div class="nota_amarela_cair"></div>
	<div id="fim" style="position: absolute; display: none;"></div>
    <button id="comecar" onclick="newgame()">Comecar
	</button>   
    <div class="teclas">
				<ul>
					<li class="nota_amarela">1</li>
					<li class="nota_azul">2</li>
					<li class="nota_verde">3</li>
					<li class="nota_roxa">4</li>
					<li class="nota_vermelha">5</li>
				</ul>        
    </div>
    
    
</div>
<div id="progressbar" style="width: 1000px !important; height: 5px; 
margin-left: 10px; margin-right: 10px;"><div class="progress-label"></div></div>

CSS

body {
    padding: 0px;
    margin: 0px;
    text-align: center;
    font-family: Arial, sans-serif;
    font-size: 14px;
    background-color: darkgray;
}
.bgplay {
    width: 1000px;
    height: 400px;
    background-color: darkgray;
    margin-left: auto;
    margin-right: auto;
    border: darkgray 1px solid;
    opacity: 0.8;
    -webkit-border-radius: none;
    -moz-border-radius: none;
    border-radius: 0px;
}
.ui-progressbar {
    position: relative;
}
.progress-label {
    position: absolute;
    left: 50%;
    top: 4px;
    font-weight: bold;
    text-shadow: 1px 1px 0 #fff;
    color: darkgray;
}
.teclas {
    color: white;
    font-size: 21px;
    width: 250px;
    height: 40px;
    display: inline;
    float: left;
    margin-top: 342px;
    margin-left: 284px;
}
.teclas li {
    float: left;
    list-style-type: none;
}
#comecar {
    cursor: pointer;
    float: left;
    width: 73px;
    height: 26px;
}
.nota_azul {
    background-color: transparent;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    -moz-border-radius: 50%;
    -webkit-border-radius: 50%;
    border: 2px #0B6969 solid;
    margin-left: 10px;
}
.nota_amarela {
    background-color: transparent;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    -moz-border-radius: 50%;
    -webkit-border-radius: 50%;
    border: 2px #969600 solid;
    margin-left: 18px;
}
.nota_verde {
    background-color: transparent;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    -moz-border-radius: 50%;
    -webkit-border-radius: 50%;
    border: 2px #18A400 solid;
    margin-left: 7px;
}
.nota_roxa {
    background-color: transparent;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    -moz-border-radius: 50%;
    -webkit-border-radius: 50%;
    border: 2px #AC00AC solid;
    margin-left: 7px;
}
.nota_vermelha {
    background-color: transparent;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    -moz-border-radius: 50%;
   ...

JavaScript

var acertos;
var inicio;
var fim = 455;
var valorAtual;

function newgame(){
    $("#comecar").hide();
    $("div.teclas").css("margin-right", "393px");
    $("div.teclas").css("float", "right");
    $("div.bgplay").css("opacity", "1.0");
    hover();


    verde();

function verde() {
    inicio;
    acertos = 0;
    
    function testarAcerto(e) {
        if (e.which == 51 && Math.round(valorAtual) > 0) {
            $('.nota_verde_cair').remove();
            acertos++;
            $(document).bind("keyup");
        }
    }
    
    $(".nota_verde_cair").fadeTo( 500, 1 );
    $(document).bind("keyup");
    $('.nota_verde_cair').animate({
        top: fim + "px"
    }, {
        duration: 6000,
        start: function () {
            inicio = window.getComputedStyle(this).top.replace('px', '');
            $(document).bind("keyup", testarAcerto);
        },
        progress: function (a, p, r) {
            valorAtual = p * (fim - inicio);
            $(document).bind("keyup");
        },

        complete: function (verde) {
            $('.nota_verde_cair').remove();
            $(document).unbind("keyup");
        }
    });
}
    
    
    
    
    function hover() {
    
    $(document).keydown(function(e) {
    if(e.which == 49) {
    $('li.nota_amarela').css('border', '2px black solid');
    }
});

$(document).keyup(function(e) {
    if(e.which == 49) {
    $('li.nota_amarela').css('border', '2px #969600 solid');
    }
});

$(document).keydown(function(e) {
    if(e.which == 50) {
    $('li.nota_azul').css('border', '2px black solid');
    }
});

$(document).keyup(function(e) {
    if(e.which == 50) {
    $('li.nota_azul').css('border', '2px #0B6969 solid');
    }
});

$(document).keydown(function(e) {
    if(e.which == 51) {
    $('li.nota_verde').css('border', '2px black solid');
    }
});

$(document).keyup(function(e) {
    if(e.which == 51) {
    $('li.nota_verde').css('border', '2px #18A400 solid');
    }
});

$(document).keydown(function(e) {
   ...