css all divs vs direct child divs

Answer 1

Something like this?

.Root > :first-child, .Root > :last-child { border: 1px solid red }
.Root { color: green; }

Demo: http://jsfiddle.net/karim79/N5qFu/1/

I would advise you to go through this: http://www.w3.org/TR/css3-selectors/