Issues w responsiveness of grid container with video

Hi there,
I cannot get my paragraph and video where it says “built with instant accessibility” to be responsive on the mobile landscape viewport and below- both the video and the words run off the screen and I cannot figure out why the response is not automatic- would someone be able to help me out with this? thanks!

below is my read only link:

Here is my site Read-Only: LINK
(how to share your site Read-Only link)