Are you referring to the background cell color? If so, there is currently a bug for this, since they are not being included when the page is exported to Word:
Please vote on that case, as it helps show the developers how many users have run into the issue.
Otherwise, Scroll Office may help you to format and create Word Exports that are properly displayed. Have a look at that add-on and if you have any questions, ask away!
Atlassian Cloud Support
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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