Hi,
We are interested in having your feedback on the usability of our website before it goes beta: MockupUI.
The website is about a UI prototyping tool for desktop applications and its goal is to help users easily find out what they can do with the software and how to use it. They should have access the documentation pages (example projects, reference manual and FAQ) from both desktop and mobile devices.
Thanks.
Even at full screen (width 1366px) I get a horizontal scrollbar, so no it’s not fully responsive. I didn’t look any further.
There are a few problems in your css causing the horizontal scroll bars.
.banner has its width set to 100% which with the addition of padding makes it wider than the screen. Changing that to width: auto will fix that.
The other problem is in your footer.
.container has some fixed widths set, which is never a good idea in RWD.
Disabling width: 724px will make another one active, width: 940px.
Disabling both these to revert to width: auto fixes the footer problems.
With a new web-page I always first of all always HTM VALIDATE
Then proceede to CSS VALIDATE
After removing as many errors and warnings as possible I then check GOOGLE MOBILE USABILITY
Only then do I check for bottlenecks using TOOLS PINGDOM to see if there are any problems which can be solved to make the web-page load faster.
Looks like you have quite a bit of optimisation to do 
Please report back with errors that have been eliminated and how they enhance the web-page.
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