need to change drop-downs style in whole website in whole admin panel via team viewer only

plz come on chat now so we can discuss more....am waiting... Dear Sir, I am really interested to work on this project, I can start the work now , and can provide the best services from my end. Please come on chat to discuss more about the project. Regards, Bhagwan

We can change it and also use CSS to let them more usable to tour clients. Looking forward to your answers.