Use font declaration 700:
@font-face { font-family: 'Open Sans'; font-style: normal; font-weight: 700; src: local('Open Sans Extrabold'), local('OpenSans-Extrabold'), url(http://themes.googleusercontent.com/static/fonts/opensans/v6/EInbV5DfGHOiMmvb1Xr-honF5uFdDttMLvmWuJdhhgs.ttf) format('truetype'); }
or as in your example:
<link href='http://fonts.googleapis.com/css?family=Open+Sans:800italic,700,300,600,800,400' rel='stylesheet' type='text/css'>
and then:
.yourClass {font-family: 'Open Sans'; font-weight: 700;}
In the same way as in italics, because it determines the type of CSS font , and in.
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