:root {
    --page-transition-duration: .5s;
}

/* html.is-changing .transition-fade {
    transition: opacity var(--page-transition-duration) ease;
    opacity: 1;
}

html.is-animating .transition-fade {
    opacity: 0;
} */

html.is-changing .transition-fade {
    transition: opacity var(--page-transition-duration);
}

.transition-fade.is-next-container {
    opacity: 0;
}

.transition-fade.is-previous-container {
    opacity: 0;
}