Open Sans Google Web Fonts Rendering in Chrome

Add to head

<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,600,300' rel='stylesheet' type='text/css'>

CSS rule

.btn{
    font-family: 'Open Sans', sans-serif;
    font-weight:300;
    text-rendering: optimizeLegibility;
font-size: .9em;
}

I've had luck in the past using font-weight: lighter!important; on fonts that appear bolder and completely different than what they are intended to look like. Each browser interprets fonts differently. Google Web Fonts tries its best to serve the correct versions, but sometimes there are drastic changes between browsers and operating systems.

Hope this information helps! Let me know if this solution works, otherwise I can look into it further. Open Sans is a nice font for web, nice choice :)

I added directly this line im my header and it's working!

<link href='//fonts.googleapis.com/css?family=Open+Sans:300,400,600' rel='stylesheet' type='text/css'>

.nav > li > a {
    color: #000; font-size: 13px; font-weight: 600;
}

Instead of just calling the font without sizes in the Header and defining it afterward as bold, a method who doesn't work.