It seems that there is no more access to the Globl CSS stylesheet
It might help to answer your question if we knew which version of Confluence you are using. The server version should display the version number at the bottom of all pages (Powered by Atlassian Confluence #.#.#).
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Click on the Gear icon in the upper right, click "General Configuration", scroll down to the "Look and Feel" section on the left menu, and the bottom option should be "Custom HTML".
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Do you refer to the HTML Macro? Maybe you need to enable it as shown in the referenced page?
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