.popup {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    left: 0;
    top: 0;
    overflow-y: auto;
    background-color: rgba(0,0,0,.3);
    z-index: 9999;
    display: none;
}
.popup .contenido {
    width: 95%;
    max-width: 600px;
    background-color: #671549;
    border-radius: 5px;
    box-shadow: 5px 5px 10px black;
    position: relative;
    padding: 20px 15px;
    text-align: center;
}
.popup #cerrar {
    position: absolute;
    right: -15px;
    top: -15px;
    width: 30px;
    height: 30px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    background-color: black;
    color: white;
    border-radius: 50%;
    font-weight: 900;
    cursor: pointer;
}

.popup h2 {
    color: #fff;
}