JSFiddle - React, Tailwind, and code Playground

HTML

<div id="abrirModal" class="modalDialog"> <a class="close" title="Fechar" href="#fecharModal">X</a>

    <div class="modal"> <span class="title_modal">Modal</span>

    </div>
</div>
<div> <span class="upgrade_description"> Upgrade 1 Segunda a Sexta das 20h às 02h</span>  <a href="#abrirModal" rel="modal" class="button">R$ 399</a>

</div>
<div> <span class="upgrade_description"> Upgrade 2 Sábados das 08h às 20h </span><a href="#abrirModal" rel="modal" class="button">R$ 299</a>

</div>
<div> <span class="upgrade_description">Upgrade 3 Sábados das 08h às 14h - 14h às 20h </span><a href="#abrirModal" rel="modal" class="button">R$ 199</a>

</div>
<div> <span> Upgrade 4 Domingo das 08h às 14h - 14h às 20h </span><a href="" rel="modal" class="button">R$ 199</a>

</div>
<div> <span class="upgrade_description"> Upgrade 5 Sábados das 20h às 2h  </span><a href="#abrirModal" rel="modal" class="button">R$ 199</a>

</div>

CSS

.modalDialog {
    position: fixed;
    font-family: Arial, Helvetica, sans-serif;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99999;
    opacity:0;
    -webkit-transition: opacity 400ms ease-in;
    -moz-transition: opacity 400ms ease-in;
    transition: opacity 400ms ease-in;
    pointer-events: none;
    overflow:scroll;
    /* activa scroll da página se a modal for muito comprida */
}
.modalDialog:target {
    opacity:1;
    pointer-events: auto;
}
.modalDialog > div {
    width: 600px;
    position: relative;
    margin: 5% auto;
    border-radius: 10px;
    background: #fff;
    -moz-box-shadow: 1px 1px 30px #000;
    -webkit-box-shadow: 1px 1px 30px #000;
    box-shadow: 1px 1px 30px #000;
}
.close {
    background: #00B92F;
    color: #FFFFFF;
    line-height: 25px;
    position: absolute;
    right: -12px;
    text-align: center;
    top: -10px;
    width: 24px;
    text-decoration: none;
    font-weight: bold;
    -webkit-border-radius: 12px;
    -moz-border-radius: 12px;
    border-radius: 12px;
    -moz-box-shadow: 1px 1px 3px #000;
    -webkit-box-shadow: 1px 1px 3px #000;
    box-shadow: 1px 1px 3px #000;
}
.close:hover {
    background: #2AFF2A;
}
.modalpic {
    float: left;
    display: block;
}

JavaScript

var upgrades = document.querySelectorAll('.button');
var modal = document.querySelector('#abrirModal .title_modal');
for (var i = 0; i<upgrades.length; i++){
 upgrades[i].addEventListener('click', mudarTitulo);   
}

function mudarTitulo(){
    modal.innerHTML = this.parentNode.querySelector('span').innerHTML;
}