How Can I Over Ride These Styles?

I've been pulling my hair out for months trying to figure out how to display my custom menu in the side bar and used FireFox to debug this.

I'm using Atahualpa 3.6.4

In the Menu item...
- Sidebar & Widgets -> Style Widgets

How can I over ride the following items in Widget List Items and Widget List Items, 2nd level?

- Left Margin for whole Item (set to 0)
- Left Border Width for Links (set to 0)
- Left Padding for Links (set to 0)

And also the following...

Here is a code snippet of my menu item...

<div id="imouter0" class="imcm">
<ul id="imenus0">
<li id="ulitem0z0" class="imatm" style="width:100%;"><a id="ulaitem0z0" class="" href="http://www.stun-guns.htm"> … </a><div class="imsc"> … </div>
</li>

For the <a></a> tag inline: 679, I need to override the display: inline; to make it unchecked or disabled. Here is the CSS.

div.widget ul li a:link, div.widget ul li a:visited, div.widget ul li a:active, div.widget ul li a:hover {
display: inline; // UNCHECK
}

For the <li></li> inline: 600, I need to override the line margin: 2px 0px; to make it unchecked or disabled. Here is the CSS.

div.widget ul li {
display: block;
margin: 2px 0px; // UNCHECK
}

Thank You for your help! - Glenn