Modifing the login and reset password button

Hello i have a question on how to modify the login and reset password buttons in next cloud?
My buttons are blue, but i wanna have a little bit grey and transparenty login buttons, and is it possible to create such fileds (username/email/password field)?

See this picture, i wanna have such buttons and the fields in this style. What kind of css code do is that? Can someone give me the stiling code?

Bildschirmfoto 2020-11-24 um 20.48.37

Bildschirmfoto 2020-11-24 um 20.48.45

You can try

But this is not a dev topic. I’ll move to support.