Overrides are sections of code that can be used to modify certain parts of your journal. They are inserted into the styles override box near the bottom of the Modify Journal page (http://www.blurty.com/modify.bml).
They are used to set exceptions to the system styles, and as such involve limitations and complications.
The only HTML elements that can be used in the *_HEAD overrides are those elements that are valid in the head of a HTML document. This is limited to <title>, <base>, <style>, <link>, and <meta>. All other elements are stripped. If your overrides are not changing the look of your journal, that is most likely the reason.
There are a number of ways to use the override system. The above links describe only some of these ways. Due to the potential diversity and complexity of all available overrides, it would be impossible to officially support them all.
Please note: You can only have one override for each variable. If you have more than one change that you want to make to a variable, you will need to merge your overrides for that variable into one override. More information on merging overrides can be found here: http://www.blurty.com/talkread.bml?journal=customization&itemid=1977
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