<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.outer{
height: 500px;
border-bottom: 10px solid #000;
margin: 500px auto;
overflow: hidden;
}
.outer div{
width: 100px;
height: 100px;
border-radius: 50%;
background-color:#bfa;
animation: ball .5s forwards linear infinite alternate;
float: left;
}
div.box2{
background-color:blue;
animation-delay: .1s;
}
div.box3{
background-color:blueviolet;
animation-delay: .2s;
}
div.box4{
background-color:chartreuse;
animation-delay: .3s;
}
div.box5{
background-color:cyan;
animation-delay: .4s;
}
div.box6{
background-color:darkorange;
animation-delay: .5s;
}
div.box7{
background-color:deeppink;
animation-delay: .6s;
}
/* 创建关键帧 */
@keyframes ball{
from{
margin-top: 0;
}
to{
margin-top: 400px;
}
}
</style>
</head>
<body>
<div class="outer">
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
<div class="box4"></div>
<div class="box5"></div>
<div class="box6"></div>
<div class="box7"></div>
</div>
</body>
</html>