I remember exploring a "traditional html with images" website about natural selection (I don't think it was interactive, but I do think the source code for each

I remember exploring a "traditional html with images" website about natural selection (I don't think it was interactive, but I do think the source code for each experiment was provided). I assume it was made by a mathematician / physicist. Do you by chance happen to know which site I have in mind? I (vaguely) recall a blueish gray background.