On desktop LCD the new theme has low contrast and too large a line spacing, making reading version history difficult.
To fix it, I use the "Custom Style Script" add-on to Firefox (I use FF V.52.6.0 ESR). It allows you to inject custom CSS to any site. That add-on supposed to be also available for Chrome.
I use it to inject the following CSS to the winscp.net site. This is the custom code I use: