[BUG] Non-text elements lack sufficient colour contrast. #1758
Description
(This is split out from #1738)
From @delphinegilbert:
Hello,
An accessibility audit was performed on Accessibility Insights for Windows in our department and the following issue was found:
Description of issue
Right under "Live Inspect", there is a search input field that lacks any kind of visible border which makes it difficult to see. The input field's colour contrast fails against the white background.
Impact on users
This will especially impact people with low vision and non-keyboard, as users may not see at all that they the input field is there.
Steps to reproduce
Launch the program, and dismiss the startup windows. Using your mouse, hover or click on any other window for the program to start inspecting. It should then display an item tree, there there's a search field at the top.
