injecting custom css, does not recognize symbol / inside the class

injecting custom css, doesn't recognize symbol / inside class .nameofmyclass:first-of-type {
grid-column: 2 / span 2;
} does not want to recognize the symbol / in the inspector, it takes it as invalid because it does not show the /...

27 minutes ago, christianXatoxi said:

injecting custom css, doesn't recognize symbol /

This is because the Custom CSS panel is actually the Custom Less panel.

Less (Leaner Style Sheets) will interpret the "/" as a mathematical operator. You should be able to avoid this by escaping the string as described in the article I have linked.

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I am placing the scaping as it is and it only shows me a syntax error... and of course now it works worse in fact