测试动画效果

<div id="idx">
   <p>
       #idx{width:100%;max-width:320px;margin:0 auto;height:180px;position:relative;overflow:hidden;box-sizing:border-box;background:#0f172a;color:#e2e8f0;border-radius:10px;padding:12px} @supports (aspect-ratio:16/9){#idx{height:auto;aspect-ratio:16/9}} #idx .t{position:absolute;left:5%;top:6%;margin:0} #idx .cell{position:absolute;top:44%;width:16%;height:26%;border:1px solid #334155;border-radius:6px;box-sizing:border-box;display:flex;align-items:center;justify-content:center;color:#94a3b8} #idx .c0{left:2%}#idx .c1{left:22%}#idx .c2{left:42%}#idx .c3{left:62%}#idx .c4{left:82%} #idx .cur{position:absolute;top:44%;left:2%;width:16%;height:26%;box-sizing:border-box;border:2px solid #38bdf8;border-radius:6px;background:rgba(56,189,248,.20);animation:walk 3s infinite} #idx .lab{position:absolute;top:76%;left:2%;width:16%;text-align:center;color:#38bdf8;animation:walk 3s infinite} @keyframes walk{0%,18%{transform:translateX(0)}20%,38%{transform:translateX(125%)}40%,58%{transform:translateX(250%)}60%,78%{transform:translateX(375%)}80%,100%{transform:translateX(500%)}} @media (prefers-reduced-motion:reduce){#idx .cur,#idx .lab{animation:none;transform:translateX(0)}} 
   </p>
   <p class="t">
       range(5) 依次取到的下标：
   </p>
   <div class="cell c0">
       0
   </div>
   <div class="cell c1">
       1
   </div>
   <div class="cell c2">
       2
   </div>
   <div class="cell c3">
       3
   </div>
   <div class="cell c4">
       4
   </div>
   <div class="cur">
        
   </div>
   <div class="lab">
       i
   </div>
</div>
<p>
   补全下面的程序，让它依次打印这 5 个下标：
</p>
<pre>
   <code class="language-plaintext">for i in range(【0】):
       print(【1】)</code>
</pre>