style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    background: whitesmoke;
    overflow: hidden;
}

span {
    position: absolute;
    pointer-events: none;
    filter: drop-shadow(0 0 15px rgba(0, 0, 0.5));
    animation: fadeInOut 1s linear infinite;
}

@keyframes fadeInOut {
    0%,
    100% {
        opacity: 0;
    }
    20%,
    80% {
        opacity: 1;
    }
}

span::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: url(code.png);
    background-size: cover;
    animation: moveShape 1s linear infinite;
}

@keyframes moveShape {
    0% {
        transform: translate(0) rotate(0deg);
    }
    100% {
        transform: translate(300px) rotate(360deg);
    }
}