This was added since Chrome 81 named "Updates to Form Controls and Focus" as an experiment and was applied by default since Chrome 83.
The relevant flag is chrome://flags/#form-controls-refresh (Web Platform Controls updated UI), setting to "Disabled" should at least revert some (if not all) design to the form control and focus.
Google Chrome ...
I created a minimalistic Google Chrome browser extension to disable the text highlights from search results (some people reported that the browser configuration flag doesn't work in some cases).
You can find it here: https://chrome.google.com/webstore/detail/disable-google-search-tex/ompocnnmgiaoieoanemepjflbokldhom
The extension is open source software, if ...