External style sheet. style applied in internal browser but not applied with external browser

Hi all,

I’m in trouble with usign an external style sheet. Here is a very simple page example:

image
image.png1193×349 14.5 KB

Paragraph is custom styled with a “my-title” class simply giving a backcolor:
image

Everything is ok until a preview it in chrome where style definition has desapeared:

image
image.png1343×553 87.5 KB

what’s wrong ?

Thank’s

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