body {
    background-color: #222;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

span {
    background-image: url('https://cdn4.iconfinder.com/data/icons/ionicons/512/icon-ios7-heart-outline-256.png');
    background-size: cover;
    width: 100px;
    height: 100px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    animation: heart-animation 6s linear;
    filter: invert(1);
}

@keyframes heart-animation {
    0% {
        transform: translate(-50%, -50%);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -4000%);
        opacity: 0;
    }
}