.NavInicial{
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    /* background: rgb(0, 0, 0); */
   /*  transition: opacity 10500ms;  */
}

.NavOpen_1{
    z-index: 1;
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}
.NavOpen_2{
    z-index: 2;
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}