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I recommend using Chrome Developer Tools or Firefox Developer Tools to hunt down the CSS. You find the element you want to change, then see what styles apply to it. Once you find the styles, search the CSS folder for the files that contain those styles. To do this you will need a basic text editor that can search within files - a good free option is Notepad++. Also, the CSS for the Elemental theme is written in Less, so you might bump into some things that require you to reference the Less documentation.
https://developer.chrome.com/devtools...
https://developer.mozilla.org/en-US/docs/Tools...
https://github.com/concrete5/concrete5-5.7.0/tree/develop/web/concre...
http://notepad-plus-plus.org/
http://lesscss.org/