<!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>
.box {
position: relative;
width: 600px;
height: 60px;
border-radius: 60px;
overflow: hidden;
box-sizing: border-box;
background-color: #a9a9a9;
}
.box::after {
content: "";
position: absolute;
width: 100%;
height: 200%;
top: 0;
left: 0;
background: repeating-linear-gradient(-45deg, yellow 0 20px, transparent 20px 40px);
animation: move 0.5s linear infinite;
}
@keyframes move {
from {
transform: translateY(0);
}
to {
transform: translateY(-58px);
}
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>