here is my HTML code:

<link rel="icon" media="screen" href="A" type="image/png" />
<link rel="icon" media="(prefers-color-scheme:dark)" href="B" type="image/png" />
<link rel="icon" media="(prefers-color-scheme:light)" href="C" type="image/png" />

The first link is used as a fallback for those browser doesn't support prefers-color-scheme.

(Tested with Chrome)
When URL A point

O arquivo source-dataset.txt deve contar as fontes de cada citação que está em dataset.txt. Algumas citações estão com fontes faltando, como:

"Se eu falasse manso, não estaria nos jornais amanhã. Observem as reportagens." - [insert source]

E você pode inserir

About half the classes listed on the homepage do not yet have pages created for them. We need to get these pages made and older pages updated to continue to be a relevant source of information for CS students at Cornell.