Need css improvements for a website built in (Reactjs and Nodejs)

Hello, I have a website [login to view URL] Website is built using Node and React. Please only contact if you know Reactjs and Nodejs, as you will need these to get the src code running on your environment. In your project response please include the phrase 'Reactjs', otherwise I will immediately ignore it. I want some css enhancements: 1) I want the ring in the middle to remain in view when the user scrolls 2) When a search is executed, there is a loading spinner on PC (This doesn't work on mobile) 3) The background where the ring is doesn't appear on mobile (it is white) 4) On PC when hovering over segments in the circle, there is a tooltip and onclick navigates to the underlying url, On mobile hover doesnt work, so instead when a user clicks a segment on mobile I want to show a tooltip/modal, and only on mobile have a link within the tooltip that the user can then click to navigate to the underlying url