Designing websites // Template for developers

Hi guys, I’m designing some sites but always struggling when working with developers for the size and responsiveness of the site. When I design it, it looks good to me - but whenever developes start coding it, they get sizes etc wrong.

Does anybody know or have a template they use to design sites?Something with grid lines to keep everything in the right uniformed way and so developers get it quickly?

Eg. Taking into account responsiveness etc.

I just research online and found most popular was 1366px wide resolution - but wondered what you guys use when designing sites before giving to a developer to make life easier