Single post in Guide to CSS: Beginner to Expert

By default, there is a bottom border on ".tabbed_interface > div", which is .tab/.tab-active. So if you add border color code, or unset the border to that section of your code, it should help. > .tab, > .tab-active { background: #EEEBE0; color: #464026; padding: 2.5%; /* change border color */ border-color: red; /* remove border */ border: none; }