Alea Default Sidebar

Hi there,
I try to adjust default sidebar I want to use only on blog pages.
1. Where can I delete dotted lines that are to the right of the widget, eg.
CATEGORIES………………….
TAGS……………………….
2. On the blog page I have some widgets in the sidebar like Categories, Tags, Latests Post. Under them there is a list of the names of categories, tags, posts. The list starts with the small bullets with little arrow icon. When I hover over it the colour changes to blue. Where can I change the colour of these bullets? It looks it doesn’t inherit the main colour.