.modal {
    
    width: 106% ;
    height: 140vh;
    background: rgba(252, 250, 250, 0.459);
    
    position: fixed;
    top: 0;
    left: 0;

    display: flex;

    animation: modal 1s 2s forwards;
    visibility: hidden;
    opacity: 0;





}

.contenido {
    margin: auto;
    width: 40%;
    height: 40%;
    background: rgba(77, 61, 148, 0.774);
    border-radius: 10px;
}

#cerrar {
    display: none;
}

#cerrar + label {
    
    
    
    color: rgba(255, 255, 255, 0.945);   
    font-size: 25px;
    z-index: 50;  
    
    line-height: 40px;
    
    right: 10px;
    cursor: pointer;

    animation: modal 1s 2s forwards;
    visibility: hidden;
    opacity: 0;
}

#cerrar:checked + label, #cerrar:checked ~ .modal {
    display: none;
}

@keyframes modal {
    100% {
        visibility: visible;
        opacity: 1;
    }
}