We'd like to do something similar to the following. However, instead of doing this globally, we only want to change the code macro for only one space because spaces are managed by different teams.
To set the default appearance of code blocks in your site:
This is not really possible. You may be able to hack it together using custom CSS for a space: https://confluence.atlassian.com/doc/styling-confluence-with-css-166528400.html#StylingConfluencewithCSS-GettingStarted
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