style.css

h1,
a {
    color: white;
    font-size: 6rem;
    text-shadow: 0rem 0rem 1rem rgba(0, 0, 0, 0.5);
}

p {
    color: white;
    font-size: 2rem;
}

.menu {
    height: 100vh;
    width: 100vw;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    view-transition-name: pantalla-completa;
}

.area {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.area-imagen {
    z-index: -1;
    position: absolute;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.5);
    transition: all 0.5s ease
}

.area:hover .area-imagen {
    transform: scale(1.3);
    filter: blur(0.2rem)
}

.flex-column-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

@keyframes aparecer {
    from {
        opacity: 0.5;
    }

    to {
        opacity: 1;
    }
}

@keyframes desaparecer {
    from {
        opacity: 1;
        transform: scale(1);
    }

    to {
        opacity: 0;
        transform: scale(0.8);
    }

}

::view-transition-old(pantalla-completa) {
    animation: desaparecer 1s ease-out;
}
::view-transition-new(pantalla-completa){
    animation: aparecer 600ms ease-in;
}