Border colour with focus in a form field, Changing the border colour Options

[Blueie]

Hello

Is it possible, please, to change the border colour only (not the background) of an input field on a Web form where that field has 'focus'? In other words, if the user is typing in his name, the border of the field he is typing in is in one colour while the other fields retain their original colour. Then, when the user moves on to the email field, that field also changes it's colour, because it has focus while the name field reverts back to its original colour.

Many thanks

Blueie