Add '/' between menu items

Hi, I'm working on my new theme and I would like to add a '/' between each item (except the last one) in the fixed header top menu and add a 3px #4d788a border-bottom on hover, pretty much like in this website -> http://goo.gl/ZrL5xP. I could really appreciate any help because all my attempts were fruitless and I don't know what else to try. Thank you in advance. PS. I'm using WAMP to work on / test the new theme, therefore I don't have a link to my website to post, yet.