I pass this along for your information only, as it may relate to your work on version 5 and I don’t want to start a new thread.
On my site
https://www.hiskingdomprophecy.com/ I use your standard “Search” widget in my Primary Sidebar.
As far as I recall, I have not customized the Search Box, so it has a default 3D shadowed appearance with a text area slightly darker than the Sidebar background and has remained unchanged since it was set up.
I also use the ‘Classic Widgets’ plugin to avoid widget blocks.
My default Admin browser is Firefox and it renders the Search Box correctly.
However, recently, I have noticed on phones that Search Box is always not rendering correctly, with most displaying a dark bold line around the search input textarea.
This did not concern me much, as I know that phones often display things differently.
However today, I checked and to my surprise, the Microsoft Edge, Opera, Brave and the AVG Secure Browser were all displaying a dark/bold search input textarea border box.
After inspecting the Search Box, I found that it was all under:
.search-form style.weaverx.min.css:2 and since you are about to upgrade, I thought I’d just pass it along here for your information.
I am not looking for a fix in V4.
Regards and thanks,