直接上代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.line {
border: 1px solid #f00;
text-align: justify;
}
.line::after {
content: '';
display: inline-block;
padding-left: 100%;
}
</style>
</head>
<body>
<div class="line">
测试
</div>
</body>
</html>
image.png
