Strip HTML Elements by Class

Does it work? For example, I want to remove the SPECIAL OFFER block from here: https://cryptopotato.com/argo-blockchains-btc-production-in-december-crippled-by-a-winter-storm/ I type in Strip HTML Elements by Class: code-block code-block-12 And it doesn't work. Do you have a full video guide on how to strip elements? I tried with other website, the same.