Changing color of New! posts

Hi there
I'm using version 1.0 theme and want to change the yellow color for New! posts. I'm slightly lost with which CSS file I need to be looking at.
Thanks for any help.
I'm using version 1.0 theme and want to change the yellow color for New! posts. I'm slightly lost with which CSS file I need to be looking at.
Thanks for any help.
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