The word “Selenium” comes from Greek, "selene" means moon. This naming is related to the reflection of selenium which is multiplied 1,000 times when selenium was brought from the darkness into the sunlight.
By this inspiration, we created Selenium style for XenForo 2 with a dark background - The Black color and with each of small navigation box, it shades yellow color like the color of sunlight.
By listing all the menu by dropping down them, you could switch between tabs by clicking into the main Navigation and then choosing what you want to go. The Search Box has been added underneath the menu and you could find out the recent post easily by clicking into the box next to Search Box.