Can someone help me identify what this website theme is? I have seen it a couple of times on other websites as well.
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Not sure about that particular one, because it's not signed (which makes me think it's either custom-made or "taken"), but if you are using WP you can find some similar free ones here, or doing a search for free WP themes.
Even the WP default theme looks similar to that once you edit some small things (you can add the black details in your custom.css file).