<!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>border ranbom</title>
<style>
.rbox {
width: 320px;
height: 240px;
/* border: 3px solid #ccc; */
position: absolute;
left: 200px;
top: 200px;
overflow: hidden;
border-radius: 10px;
}
.rbox .inner {
width: 520px;
height: 520px;
background-image: linear-gradient(-60deg, red, yellow);
animation: rbox 3s linear infinite;
position: absolute;
left: -100px;
top: -100px;
}
.rbox .content {
background: white;
position: absolute;
left: 6px;
right: 6px;
top: 6px;
bottom: 6px;
border-radius: 6px;
}
@keyframes rbox {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="rbox">
<div class="inner">
</div>
<div class="content">
sfsdf
</div>
</div>
</body>
</html>