Beautify your Gmail header by removing the top navigation bar and the associated dark gray and light gray bands. Keep only what you need and your focus on your inbox, not the page header. Use with your favorite userstyles plugin for your browser of choice. Just be sure to apply these styles to the domain: "https://mail.google.com*"

gistfile1.css

#gbz, #gbx1, #gbx3 { visibility: hidden !important; }
#gbz { opacity: 0 !important; -webkit-transition: opacity 0.15s linear; }
#gbz:hover { opacity: 1 !important; }
#gbz .gbzt { font-weight: normal; color: #88 !important; }
#gbz .gbzt:hover { color: black !important; }
#gbz .gbz0l .gbts { color: #888 !important; font-weight: normal; }

#gb.gbem { height: 75px !important; }
#gb.gbes { height: 52px !important; }
#gb #gbq, #gb #gbu { top: 8px !important; }
#gb #gbq.gbes, #gb #gbu.gbes { top: 7px !important; }