html - 如何仅将 css 属性应用于我的第一个 div 类

Question

我有两个 dhx_scroll_cont div 类，当我编写 css 代码时，它适用于两个类。现在我想写一个申请第一个div调用的css代码

.dhx_scroll_cont:before{
    //some code here
    }

Answer 1

Demo Fiddle

只需使用:

.dhx_scroll_cont:first-of-type:before{
    //some code here
}

more on first-of-type

The :first-of-type CSS pseudo-class represents the first sibling of its type in the list of children of its parent element.

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更新

根据 the screenshot the OP posted以下应该有效:

.dhx_view_day_events .dhx_scroll_cont:first-of-type:before{
    //some code here
}