You can modify the CSS files inside /css folder to customize the theme. General layout and CSS rules can be found in template.css file, and different presets (or styles) are defined in styles.css file. Simply open up these files in a text editor, modify to your liking, save the changes, and you're done.
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Consider using the custom stylesheet for all your CSS customizations:
gantry-framework.org/documentation/wordp...custom_stylesheet.md
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