CSS File

Hi, can anyone help me locate the location of the CSS file for the default profile link that is on the sidebar (the one with the tiny profile image with the name of the logged in user)? The HTML of Chrom's Inspect says its div class is "elgg-module elgg-owner-block" but I couldn't find its CSS. It must be a module. I want to change its font colour, background, and other CSS features.