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.block {
position: relative;
width: 768px;
line-height: 0;
overflow: hidden;
margin: 70px auto 0;
}
.list {
position: absolute;
top: 50%;
left: 50%;
display: flex;
width: 100%;
height: 100%;
margin-right: -50%;
transform: translate(-50%, -50%);
}
.list li {
width: 20%;
overflow: hidden;
}
.list li span {
display: block;
width: 100%;
height: 100%;
background: #55310e;
transform: translate3d(0, 0, 0);
transition: all 0.8s 1s cubic-bezier(0.5, 0.5, 0.5, 0.9);
}
.list.active li span {
transform: translate3d(110%, 0, 0);
}
@media screen and (max-width:640px){
.block {
width: 100%;
}
}
window.onload = function() {
document.getElementById("list").classList.add("active")
};