I am not familiar with what is described in the
Skins Made Easy and Jade is not a very good template to familiarize yourself with HTML or CSS.
CSS stands for Cascading Style Sheet.
CSS is made up of classes, properties, and values.
Every element in a HTML document, such as a div, span, table, or even the body tag of the document has a set of properties that can be changed using CSS.
These standards or even
guidelines if you will are set by the World Wide Web Consortium(W3.org).
Most elements have padding, margins, background or color.
If you were going to change the padding, margins, or background of every table on every page the template is used you would have a set of properties as seen below:
table {
padding:2px;
margin:0;
background-color:#000000;
}
This tells the browser that every table element in the page should have a padding of 2px, a margin of 0, and a background-color of black(hexadecimal color).
The reason Jade will be difficult to learn from is because Jade declares background properties for many of the table cells in the document itself instead of the CSS like it should. Jade also uses tables for layout of the page(tables are better suited for tubular data).
FYI
To change the colors of the Jade template check the body tag, and table cells, and then there are a few background-color properties in the CSS.
There are about 3-4 different shades of green used.