https://nicedennn.github.io/cleaner.css/
No blue glow or outline when the input is active or unpleasant gradient. I made it for myself but maybe it could help someone else.
Add the class "cleaner" to your input to clean it.
NB : Cleaner.css doesn't work on the "Checkbox", "Radio" and "Range" inputs, because they need an additionnal span etc to make a custom style.