HTML macro alternatives for adding custom CSS to a Confluence Cloud page

[Tony Chung]

I regularly use an HTML macro with a `<style>` CSS block that targets different elements to customize the look of our pages on Confluence DC (Server). Our organization is moving to Confluence Cloud, and I was informed the HTML macro is not available for cloud. I searched for alternatives to the HTML macro and found a few options, but all of them insert the HTML as an iFrame.

Are there alternate ways to use to perform this task? I use CSS primarily to add background images to certain blocks, and adjust spacing around other blocks. This prevents me from having to update the images when the background images change.