body{
    margin: 0;
    padding: 0;
}
.box{
    position: absolute;
    top: calc(50% - 150px);
    left: calc(50% - 145px);
    height: 300px;
    transform-style: preserve-3d;
    transform: perspective(1000px) rotateY(45deg);
}
.box div{
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    display: flex;
    transform-style: preserve-3d;
}
.box div span{
    position: relative;
    display: block;
    width: 50px;
    height: 100%;
    background: linear-gradient(#e8e8e8,#e8e8e8, #a7a7a7);
    animation: animate 2.8s linear infinite;
}
.box div span:nth-child(1){
    animation-delay: 0s;
}
.box div span:nth-child(2){
    animation-delay: 0.2s;
}
.box div span:nth-child(3){
    animation-delay: 0.4s;
}
.box div span:nth-child(4){
    animation-delay: 0.6s;
}
.box div span:nth-child(5){
    animation-delay: 0.8s;
}
.box div span:nth-child(6){
    animation-delay: 1s;
}
.box div span:nth-child(7){
    animation-delay: 1.2s;
}
.box div span:nth-child(8){
    animation-delay: 1.4s;
}
.box div span:nth-child(9){
    animation-delay: 1.6s;
}
@keyframes animate{
    0%{
        transform: rotateX(0deg);
    }    
    0%{
        transform: rotateX(360deg);
    }
}