Thank you for reply Tom!
But it doesn’t work very well:
768px:
https://www.dropbox.com/s/5cwx5jj1q7rybm2/768.PNG?dl=0
769px:
https://www.dropbox.com/s/pul0zs0c4t1ealz/769.PNG?dl=0
770px:
https://www.dropbox.com/s/ly8xg404ggk18w6/770.PNG?dl=0
I need to make 768 and 769 work like 770.
I prefer 767 because it looks just better and still fine with my own theme customizations 🙂