Good Mornig. I need to solve problems about the header of the page.

My website is: https://tvcmp.com/

1- Logo Size: I need the logo looks bigger than it appears. I have tried with bigger sizes and I can´t dop it. Is there an option for it

2- When I scroll with the mouse, I need the logo to disappear, leaving only the menu bar: Home and contacto. Is there a possibility to do it?

Thank you so much.