Can’t move heading style over to the left

I’m trying to move my heading styles for each section of my site map farther to the left, but the CSS properties aren’t taking. The page is here: http://idratherbewriting.com/index.

See how the bullets aren’t indented below the subheadings? I want to move the headings left.

The CSS properties for the headings is here:

.ddsg-cats {
font-size:1.6em;
color:#2582A4;
border-bottom: 1px dotted gray;
link { color: rgb(0, 0, 153) }
margin-left: -20px

}

Why isn’t margin-left doing anything? Any solutions?