*{
    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 : 800vw;
    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;
}

.wheel1 img {
    width : 77px;
    position: relative;
    top : 42px;
    left : 42px;
    animation: wheelRotation linear .16s infinite;
}

.wheel2 img {
    width : 77px;
    position : relative;
    top : -39px;
    left : 235px;
    animation : wheelRotation linear .16s infinite;
}

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

@keyframes carMove {
    100%{
        transform : translate(-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);
    }      
}