Responsive header width (logo LHS, menu RHS)

I am trying to match an unbounce page to a website so that it fits in seamlessly. However, the website I am copying has a logo top right and menu top left which are always justified to the side of the page whatever size screen. Is there a way to have a responsive header like this in unbounce?

@helenmarguerite if ur page is not responsive by itself then I probably understand what u mean because i did something similar for a client not long ago. It was a monster script, css and layers over layers. In the end, from marketing perspective I did not think it is fruitful but client was stubborn. Anyway, couple of ways you can try - calculate window width to sustain the placement (I used Jquery to do that). Or you can also try using CSS viewports.