Make a page showing two animal photos, and a drawing. Use whatev er animal you like. I'll use (surprise!) doggos.
The drawing should have a transparent background. Here's a sample page.
Give the page a background color, so the transparency shows.
Hint: images with transparency are often called isolated images. Good to know when you're searching.
Make sure the page has all of the tags it needs. Use a separate style sheet. Protect your work with a password. Submit the URL of the solution.