/* Fondo oscuro */
.modal{
    display:none;
    position:fixed;
    z-index:99999;
    left:0;
    top:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,.75);
    justify-content:center;
    align-items:center;
    animation:fadeIn .3s;
}

/* Contenedor */
.modal-contenido{
    position:relative;
    width:90%;
    max-width:850px;
}

.modal-contenido img{
    width:100%;
    border-radius:12px;
    box-shadow:0 10px 30px rgba(0,0,0,.5);
}

/* Botón cerrar */
.cerrar{
    position:absolute;
    top:-18px;
    right:-18px;
    width:40px;
    height:40px;
    background:#c00000;
    color:#fff;
    border-radius:50%;
    text-align:center;
    line-height:40px;
    font-size:28px;
    cursor:pointer;
    font-weight:bold;
    box-shadow:0 0 10px rgba(0,0,0,.4);
}

.cerrar:hover{
    background:#900;
}

@keyframes fadeIn{
    from{
        opacity:0;
    }
    to{
        opacity:1;
    }
}