How to fix a font problem?

Question

css

Link to css in the template

<link rel='stylesheet' id='google-fonts-css'  href='https://fonts.googleapis.com/css?family=Open+Sans:400,400italic,700,600' type='text/css' media='all' />

In my css:
font-family: 'Open Sans'; font-weight: 600;
In Mozilla the font seems to be displayed as 600, but it is crossed out in the styles when "viewing the element code"
In Opera and IE it is displayed as 700.
What is wrong?

Answer 1

Crazy idea, but try changing the order.
Instead of
write
css?family=Open+Sans:400,400italic,600,700