column-rule-width

CSS 特性 column-rule-width 让你可以设置在多列布局中被画在两列之间的规则（线条）的宽度。

Formal syntax: 
<'border-width'>

/* Keyword values */
column-rule-width: thin;
column-rule-width: medium;
column-rule-width: thick;

/* Length values */
column-rule-width: 1px;
column-rule-width: 2.5em;

column-rule-width: inherit;

<br-width> 

Is a <length> or one of the thin, medium or thick keyword describing the width of the rule separating two columns.

#header {column-rule-width: thick;}