.wangceng{
height:90px;
background:red;
}
.ciwangceng{
  width: 0;
  height: 0;
border:10px solid green;
border-radius:90px;
position:relative;
animation:yi 10s infinite;



}
@keyframes yi {
  
    0% {top: 0;left: 0;}
    5% {top: 0;left:230px;}
    10%{top:10px;left:460px;}
    15%{top:30px;left:690px;}
    20%{top:40px;left:820px;}
    25%{top:60px;left:1050px;}
    30%{top:70px;left:1100px;}
    35%{top:60px;left:1010px;}
    40%{top:40px;left:840px;}
    45%{top:30px;left:600px;}
    50%{top:20px;left:400px;}
    80%{top:10;left:200px;}
    100%{top:o;left:30px;}
}