.demo_item{
	width: 60px;
    height: 60px;
    background-image: url(car.png);
    background-size: 100% 100%;
    background-position: 0 0;
    background-repeat: no-repeat;
    display: block;
    position: relative;

}
.demo_item.anime{
    animation-name: upDown;
    animation-iteration-count: infinite;
    animation-duration: 0.1s;
    animation-direction: alternate;
    animation-timing-function: steps(2);
    transition-duration: .3s;
    transition-property: transform;
}


.demo_stage{
    position: relative;
    width: 100%;
    
    top: 0px;
    display: block;
}


.demo_wrap{
	display: block;
    position: absolute;
    top: 0px;
    animation-fill-mode: forwards;
    animation-timing-function: linear;
    animation-duration: 15s;
    animation-iteration-count: 1;
	margin-right: -5px;
}


.demo_wrap[data-order="left"] {
    animation-name: GoLeft;
}
.demo_wrap[data-order="right"] {
    animation-name: GoRight;
}

[data-order="right"] > .demo_item {
    transform: rotateY(180deg);
}


@keyframes GoLeft {
    0% {
        right: 10%;
    }
    100% {
        right: 90%;
    }
}
@keyframes GoRight {
    0% {
        right: 90%;
    }
    100% {
        right: 10%;
    }
}


@keyframes upDown {
    0% {
        top: 0;
    }
    100% {
        top: 3px;
    }
}