style.css

* {
    margin: 0;
    padding: 0;
}

body {
    overflow: hidden;
    animation: shakeBody linear 6s infinite;
}

.sky {
    height: 100vh;
    width: 100%;
    background-image: url(background.jpg);
    background-repeat: no-repeat;
    position: absolute;
}

.trees {
    height: 100vh;
    width: 100%;
    background-image: url(trees.png);
    background-size: cover;
    position: absolute;
    top: -144px;
}

.track {
    height: 60vh;
    width: 600vw;
    background-image: url(track.png);
    background-repeat: repeat-x;
    position: absolute;
    top: 70vh;
    animation: carMove linear 13s infinite;
}

.car {
    height: 100px;
    width: 380px;
    background-image: url(car_body.png);
    background-size: cover;
    background-repeat: no-repeat;
    position: absolute;
    left: 444px;
    bottom: 30vh;
    animation: shake linear 3s infinite;
}

.wheel_left img{
    width: 72px;
    position: relative;
    top: 41px;
    left: 45px;
    animation: wheelRotation linear .6s infinite;
}

.wheel_right img{
    width: 75px;
    position: relative;
    top: -36px;
    left: 236px;
    animation: wheelRotation linear .6s infinite;
}

@keyframes wheelRotation {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes carMove {
    100% {
        transform: translateX(-500vw);
    }
}

@keyframes shake {
    0% {
        transform: translateY(-5px);
    }
    50% {
        transform: translateY(5px);
    }
    100% {
        transform: translateY(-5px);
    }
}

@keyframes shakeBody {
    0% {
        transform: translateY(-50px);
    }
    50% {
        transform: translateY(50px);
    }
    100% {
        transform: translateY(-50px);
    }
}