Page Builder media query breakpoints

Hi there

I’m using the Vantage theme and Page Builder plugin on my homepage. I have a 3 column panel and currently it drops to 1 column at 780px (url here – http://oakshotel.drmdigital.co.uk/)

I can see that the media query controlling this is:

@media (max-width: 780px)
#pl-35 .panel-grid {
margin-left: 0;
margin-right: 0;
}

However, I would like to reduce this breakpoint to 700px, but I can’t figure out how to do this. I have tried overriding it using custom CSS but that doesn’t work.

Any help you could give me would be much appreciated.

Thanks
David

URL: http://oakshotel.drmdigital.co.uk/