With the upgrade – yes. Without it – no. Warining: CSS editing that theme is not an easy undertaking.
I don’t recommend fussing with the theme. There are over 190 themes to choose from. I always a190 themdvise that those who are just beginning their blog to select a minimal, clean theme and focus on creating content. Then 3 months later I advise evaluating your theme and making required changes or simply switching to another theme.