Difficulty changing font color

Line 630 in style.css – change the color to the grey code you want and font-weight (change to “normal”):

.primary_content_wrap ul li {
    background: url("images/marker.png") no-repeat scroll 0 7px transparent;
    color: #FFFFFF;
    font-size: 12px;
    font-weight: bold;
    line-height: 19px;
    list-style: none outside none;
    margin: 0;
    padding: 0 0 17px 12px;
}

Not sure which background you want to change, but it is probably either:

#commentform

or

#respond

or some variation on those (i.e. you need to add additional selectors)

For CSS questions like these, try using Firebug to identify the relevant CSS code that you need to change.