Smooth scroll on anchor (#) links and hide logo on x-pixels screen

Hello how can I put to scroll smoothly when someone clicks on an anchor link? Also I want the css code to hide the logo of the menu when its below x pixels...
url: pandashopping.com.br
example of anchor link I want to be smoothly : http://pandashopping.com.br/contato/  "entre em contato"
thanks

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