.transition-fade {
    opacity: 1;
    transition: 400ms ease-out;
}

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

.transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease-in-out;
}

html.is-changing .transition-overlay {
    opacity: 1;
    visibility: visible;
}