I really like your personalised intro @georgie_l and the questions you ask students in order to engage with the topic. I also like your softer background colour for headings, which seems to tie in with an overall colour theme. You’ve also made a distinction between explanations and examples, although try to avoid italics (for accessibility).
You were right to copy the colour code and paste it into the next heading. You can also save headings as templates by clicking on Block Templates. Have a look at the screenshot in my reply to Robert above.