.centrado{
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1050;
}

.backdrop-popup{
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1040;
    background-color: rgba(0,0,0,.6);
}

.contenedor{
    padding: 18px !important;
    position: relative;
    display: inline-block;
    min-width: 400px;
    min-height: 200px;
}

.texto-sobre-imagen{
    width: 80%;
    position: absolute;
    bottom: 15%;
    left: 50%;
    transform: translate(-50%);
    background-color: rgba(255,255,255,.6);
    padding: 8px;
}

.img-popup{
    margin: auto;
    max-width: 800px;
    max-height: 500px;
}