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The module comes with 2 css files: cmc.css & bootstrap-form.css both located in media/mod_cmc/css . In the settings of the module you have the option to turn off the bootstrap-form.css file. You don't need it if your template is using the bootstrap framework.
If you are not happy with the way the module look you'll have to style it :) Unfortunatly we can't give you any tips here. Except maybe if you don't know how you should learn to use firebug for css editing.