Post/Page specific custom CSS will allow you to add cascade stylesheet to specific posts/pages. It will give you special area in the post/page edit field to attach your CSS. It will also let you decide if this CSS has to be added in multi-page/post view (like archive posts) or only in a single view.
You will see additional meta box below text input area on posts and pages screen. You may add whatever CSS you want. You may choose if you want to add this CSS code on certain single page/post or on pages like archive etc.
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