You are not able to add custom html in cloud. There is a feature request for a banner here that you can vote on. https://jira.atlassian.com/browse/CONFCLOUD-27939
I do know of individuals who have created a image with the announcement and then added it to the header. This will then display at the top of all pages. The issue is it will also be printed on pages or on exports to pdf. It is a work around be not a very good one. You would add that in the header and footer section.
HI @Olive Sun
It depends what you mean by Information Banner.
You can still add a Header or Footer site-wide, as seen on your screenshot. You could add the macro "Blog Posts" into the Header, and then use that to provide site-wide news?
To do this:
Once blogs are created, they will then show at the top of each page dynamically (depending on the macro settings set).
For the wiki markup for this macro, see the bottom of this page. The wiki markup references the options available in the macro - for example, to show an entire blog post from the Space "TEST", based on creation, you might use:
Aside from this, there are apps which can provide announcements or news - such as:
@KevinBacon Welcome to community. If you are a space admin you can use the instructions provided above by @Stephen Wright _Elabor8_ to add a page header that will show at the top of all pages. If you would like to have that on the top of every page in the site you will need to add it as a confluence admin in general settings -> header and footer.
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