First of all, you can't import fonts to CSS that way.
You can add this code in HTML head:
<link href='http://fonts.googleapis.com/css?family=Oswald:400,300,700' rel='stylesheet' type='text/css'>
or to import it in CSS file like this:
@import url("http://fonts.googleapis.com/css?family=Oswald:400,300,700");
Then, in your css, you can edit the body's font-family:
body {
font-family: 'Oswald', sans-serif !important;
}
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