The CSS lines that affect color all have
color as part of the element. All you have to do is figure which selector is being used for the color you want to change.
Colors can be specified as Hexadecimal (#eee) or (for the 16 basic ones)their color name (black, grey, red, blue...)
for the Jacket page, this seems to bee the one
Code:
.cbjbanner {
-webkit-border-radius: 8px;
background: #eee;
border: thin solid black;
display: block;
margin-bottom: 0.5em;
margin-left: 1em;
margin-right: 1em;
margin-top: 0.5em;
padding-bottom: 1em;
padding-left: 1em;
padding-right: 1em;
padding-top: 1em
}