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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<style>
.red-point{
position: relative;
}
.red-point::before{
content: " ";
border: 3px solid red;/*设置红色*/
border-radius:3px;/*设置圆角*/
position: absolute;
z-index: 1000;
right: 0%;
margin-right: -5px;
margin-top: -5px;
}
</style>
</head>
<body>
<span>hello world</span>
</body>
</html>
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