The first is inspired by the Frutiger Aero theme. Frutiger Aero is a design style that emerged in the early 2000s, characterized by its vibrant, glossy, and futuristic aesthetic. Named after the renowned typeface designer Adrian Frutiger, this theme incorporates elements that convey a sense of modernity and high technology.
There are a few examples of when Frutiger Aero was used. One example is in operating systems: Windows XP and early versions of macOS (like OS X Tiger) showcased elements of the Frutiger Aero style, with their shiny icons, vibrant colors, and 3D effects.
The second is inspired by the flat design. The flat design is much less "out there" than Frutiger Aero, boasting more contrasting colors being used much more sparingly.
It also tends to use much simpler typography as well as minimalistic icons, shedding the skin of the over complicated past thematics used. Responsive design also became a norm - a pre-requisite instead of a fancy feature