/*  durationとpxの変更で調整可  */
.fade-in {
    opacity: 0;
    transition-duration: 1000ms;
    transition-property: opacity, transform;
}
.fade-top {
    transform: translateY(-100px);
}
.fade-bottom {
    transform: translateY(15px);
}
.fade-left {
    transform: translateX(-100px);
}
.fade-right {
    transform: translateX(100px);
}
.scroll-in {
    opacity: 1;
    transform: none;
}