Oh okay, I understand.
You probably don’t need any custom CSS for that, simpler to have it customized via the search instance back-end
– Try these settings for the searc bar: https://i.imgur.com/bZHCLcB.png
– As well as change the input and the magnifier and settings backgrounds to white or transparent.
– It gave me this layout: https://i.imgur.com/jBbM6wl.png
Try experimenting with the colors and the options a bit, it is very unlikely you need custom CSS for that.
