Drag and drop code issues on childhood leukaemia website

This drag and drop app (not mobile app) allows kids with cancer to create their own posters of themselves as superheroes to help battle the cancer.
The drag and drop software isw all there but there are some glitches that I need you to sort out please.
Th attached pic, DH hero not in frame.png, shows a hero image landing on the poster. It lands not within the poster sides and it needs to be inside the poster.
The name at the top of the poster also needs to fit the page when in mobile display. see attached image 'DH superhero name fit to page.png'.
The third task is to put code behind the 'Clear Poster' button. The code is somehwere in the files but when i moved the button it stopped working.

The code is javascript and can't be that complicated as I was able to change it for styling purposes and I am not a trained coder. I believe a competent coder could take less than an hour to make the small changes in the code necessary.

I'd really appreciate help here as this app is for kids to use as soon as they are diagnosed with cancer and should give them hope at this vry difficult time. I live on a small state pension and there is no external funding for the site. Solving these problems will take me a good step forward. Always on my mind that today and everyday in the UK 5 families will the told their child under 14yrs old will have leukaemia. This app should help them in this time of total terror.
And anybody across the globe who would like to use the app in their countries can have it for free.

Go straight to the drag and drop app at https://hero.dexsheroes.co.uk/?design=joe
and to the site at https://hero.dexsheroes.co.uk

Thanks you, Guy Barron