多列规则宽度属性用于指定列宽。您可以尝试运行以下代码以使用CSS来实现rule-width属性：
<html>
<head>
<style>
.multi {
/* Column count property */
-webkit-column-count: 4;
-moz-column-count: 4;
column-count: 4;
/* Column gap property */
-webkit-column-gap: 40px;
-moz-column-gap: 40px;
column-gap: 40px;
/* Column style property */
column-rule-style: solid;
column-rule-color: #ff00ff;
/* Colum width property */
-webkit-column-rule-width: 5px;
-moz-column-rule-width: 5px;
column-rule-width: 5px;
}
</style>
</head>
<body>
<div class = "multi">
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</div>
</body>
</html>