Hi Christian, nice work. You forgot your alt attribute on your img tag, it's important for accessibility and SEO. I saw you use a div to make your overlay. It's perfectly good. But most will use the pseudo element ::before to make that kind of effect.
For the structure I would suggest you to learn BEM methodology. Super easy to learn and it will help you to structure your class. Also, read about HTML 5. You could make your HTML structure more accessible with tag like <footer> instead of using a div with a class footer.
Hope it helps. Keep up !
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@Eric-Ferole Thanks for the advice!