{
    margin: 0;
    padding: 0;
}
.sky
{
    height: 100vh;
    width: 100%;
    background-image: url(image/sky.jpg);
    background-size: cover;
    background-position: center;
    position: relative;
    overflow-x: hidden;

}
.welcome{
text-align:center;
margin:50px;
}

.highway
{
    background-image: url(image/road.jpg);
    height: 200px;
    width: 500%;
    display: block;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1;
    background-repeat: repeat-x;
    animation: highway 5s linear infinite ;

}

@keyframes highway
{
    100%{
        transform: translateX(-3400px);

    }
}

.city
{
    height: 250px;
    width: 500%;
    background-image: url(image/city.png);
    position: absolute;
    bottom: 200px;
    left: 0;
    right: 0;
    display: block;
    z-index: 1;
    background-repeat: repeat-x;
    animation: city 20s linear infinite;
}
@keyframes city
{
    100%{
        transform: translateX(-1400px)
    }
}
.car
{
    width: 400px;
    left: 50%;
    bottom: 100px;
    transform: translateX(-50%);
    position: absolute;
    z-index: 2;

}
.car img
{
    width: 100%;
    animation: car 1s linear infinite;
}

@keyframes car
{
    100%{
        transform: translateY(-1px);
    }
    50%{
        transform: translateY(1px);
    }
    0%{
        transform: translateY(-1px);
    }
}
.wheel
{
    left: 50%;
     bottom: 178px;
    transform: translateX(-50%);
    position: absolute;
    z-index: 2;

}

.wheel img
{
    width: 72px;
    height: 72px;
    animation: wheel 1s linear infinite;
}
.back-wheel
{
    left: -165px;
    position: absolute;

}
.front-wheel
{
    left: 80px;
    position: absolute;
    
}
@keyframes wheel
{
    100%{
        transform: rotate(360deg);
    }
}