.fadeIn {
    visibility: visible;
    opacity: 1;
    transition: opacity 2s linear;
}

.fadeOut {
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s 2s, opacity 2s linear;
}

.fast-fadeIn {
    visibility: visible;
    opacity: 1;
    transition: opacity 0.5s linear;
}

.fast-fadeOut {
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s 0.5s, opacity 0.5s linear;
}