You can customise the sidebar, header and footer in the Content Tools > Sidebar, Header and Footer option. Instructions for doing so are here. You can do the same kind of thing for your whole instance by going to Confluence Administration and looking in the Look and Feel options on the left hand side.
Just in case you weren't aware we have released in BETA Refined Theme for Confluence Cloud. You're welcome to check it out https://marketplace.atlassian.com/plugins/com.refinedwiki.confluence.cloud.refinedtheme/cloud/overview
Best regards, Genevieve / RefinedWiki
In the Look and Feel options you can change the global colour scheme, the site logo and the favicon. There are also themes you can download and apply to the whole application, or just to individual spaces.
However, there is a limit to what you can do in the Cloud version of Confluence. For example, the HTML macro doesn't work in Cloud because of the potential for a security breach. If you search for "css" for Confluence in the Atlassian Marketplace, these are the results and there are a few there that look like they would help you achieve what you want. But if you filter by Cloud hosted, only 1 of those plugins works on server (and it's for showing mathematical equations, which isn't useful for you.)
So, you've got the Look and Feel options and the Content Tools > Sidebar, Header and Footer option that I mentioned, and the macros that Milo mentioned. But those are the only options, especially when it comes to using CSS.
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