Resize video on my homepage to appear correctly on mobile

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I have added custom content on my homepage (debut theme). It is a video on continuous loop with text on the left hand side. On PC it's correctly aligned, however when viewed on mobile the video goes over the top of half of the text. I have provided a screenshot. This is the first time I have set up a shopify website. I am not tech savvy. Would anyone be able to fix the code for this? Happy to provide my login details. I have attached a screenshot from the website and also the mobile. 

Any help would be greatly appreciated!