About structure
I would recommend creating different folders to organize your project. Assets folder to add CSS and images
About naming CSS classes
I would recommend using descriptive classes. Try to fix the name "child" because if I go directly to the css file, I won't know which element this refers to.
Avoid adding CSS styles to html <tags>
If your project grows, maybe you will have new images, so add a class or use nested selectors to add a style for example container.child.img to select this tag
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