How do you link CSS with Lectora to use Google API fonts?

I have been using Lectora for just shy of 1 year and never needed to use fonts that aren't accessible on all browsers. Our new client requires Avenir Lt Std (Black & Light) and Sentinel Book / Italic. I have a pretty basic html and css knowledge and need to find a way to have these fonts used. I have seen threads on this forum that talk about using Google API fonts or changing the properties on the text block to be h1 or h2 etc. so that the css isn't overridden by span attributes when referred to, but I need something fairly step-by-step to get my head around how it all links up. Any suggestions?

Discussion (1)

One way of doing this: https://lectora.com/forum/showthread.php?t=12678

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