Concise comes packed with Nicolas Gallagher's lovely Normalize.CSS to help in our cross-browser CSS rendering. Normalize does a wonderful job normalizing CSS elements to create consistency between browsers. (However, Concise is using my own forked version of Normalize that differs in small ways).
The other popular tool to help in cross-browser CSS rendering is Eric Meyer's Reset.CSS. I chose Normalize over Reset because Normalize actually preserves some useful defaults instead of just unstyling everything. Normalize also has a wider scope than Reset and is much more supported and documented.