<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="document.css">
<style>
html{
perspective: 1000px;
height: 100%;
}
.div1{
/* transition: 2s;
transition-timing-function: linear;*/
position: absolute;
width: 350px;
height: 350px;
margin:auto;
left: 0;
top: 0;
right: 0;
bottom: 0;
transform-style: preserve-3d;
transition: 6s;
animation-name: run;
animation-duration: 6s;
animation-iteration-count: infinite;
animation-timing-function: linear;
animation-play-state:running;
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