Hi Jasmine,
Have a look at this similar question which has a pretty good answer including a user macro which might work for you : https://answers.atlassian.com/questions/17434891
Basically, it is not a built in feature of Confluence. There is a suggestion ticket raised in Atlassian's public issue tracker that you could watch/vote on:
https://jira.atlassian.com/browse/CONF-7681
There are also some add-ons you could look at for this:
Hope you find something that works for you.
Sam
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