<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
.circle{
<!--设置圆点的宽、高、背景颜色，再设置圆点半径所占百分比-->
width: 10px;
height: 10px;
background-color: red;
border-radius: 50%;
<!--设置圆点与其后面的内容水平显示-->
display: inline-block;
margin-right: 5px;
}
</style>
</head>
<body>
<div class="circle"></div><span>你好</span>
</body>
</html>