Are you editing the page code? If so, why? Why aren’t you using a Custom HTML block for that? It would be easier for you.
None of the image seems to be from Pixabay on given link, If you would be more specific it would be easy for me to help you
Very step by step and to point reply by @rachidbray , I was also going to recommend same. Follow the steps mentioned in reply and let’s me know if issue persist after that also, would love to guide and help
