CSS font-family is striked red, font not applied.

Bootstrap Studio Help
1

Added Google fonts is striked red for example

font-family: 'Roboto', sans-serif;  (is striked red)

so the text it is applied to doesn't get the font. In the custom css I have

div {
      font-family: 'Roboto', sans-serif;

}

2

Did you import the font? Robots works fine for me.

3

Restarting Bootstrap fixed issue.