要填充列，请使用column-fill属性。您可以尝试运行以下代码以实现带有余额形式的column-fill属性：
<!DOCTYPE html>
<html>
<head>
<style>
.demo {
column-count: 4;
column-fill: balance;
}
</style>
</head>
<body>
<div class = "demo">
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text.
This is demo text.
</div>
</body>
</html>