For the navbar this should be a close match to what you posted above.
#navigation .pageContent {
box-shadow: 3px 0px 3px rgba(0, 0, 0, 0.15), -3px 0px 3px rgba(0, 0, 0, 0.15);
}
Or you could try a light shadow along the whole pageWidth including the header area with this...
.pageWidth {...