Question

I need to apply CSS to a specific class and id of an element like this.

<div class="contents" id="contents">

I tried

#contents .contents { ... }

but it doesn’t seem to work.

How to apply the css for a specific class and id ?

ADDED

With

#contents.contents {...} 

It works OK.

Answer 1

#contents.contents { ... }

… should work fine. The problem is likely somewhere in code that you haven’t shared with us.

#contents .contents { ... }

… means “An element that is a member of class contents that is a descendent of an element with the id contents“