Text decoration properties highlighted red in Webflow code editor

[calin_balea]

Hello folks,
I’m trying to underline a text with some custom code and i see Webflow highlights it in red as if it’s an invalid property. Any idea why? This underline also doesn’t display in Safari and I don’t understand why.

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Here is my site Read-Only: LINK
(how to share your site Read-Only link)

[calin_balea]

For more context: is-underlined is added as a combo class