Customize form font, size

Hi, please
I’d like to show only your search box in a page

so it has to be a bigger box

can you provide me your css code to customize :

change both search box and submit button with Roboto font , weight 500

change font size in search box
change font size in submit button

align search box and submit button

choose the height of the box

choose the total lenght of the search box + submit button

thanks
Chris