h2, p, .fadein, .btn {
    animation: fadein-text linear;
    animation-timeline: view();
    animation-range: 0px 320px;
}

@keyframes fadein-text {
    0% {
        opacity: 0;
        transform: translate(0, 50px);
    }

    100% {
        opacity: 1.0;
        transform: translate(0, 0);
    }
}