Lander template not being responsive

I know Envato Elements has a limited support, but I am using the template exactly as-is and it says it is responsive, which does not seem to be the case…

I created the page

When the site ios presented on larger screen, everything works fine. Then, when you starts to make teh screen smaller, the picture representing the book cover goes above the selling video… I am not finding how to make this not happen.

Thank you,