how to use google fonts with html code example

Example 1: font for css code google link

@import url(https://fonts.googleapis.com/css?family=Open+Sans);

body{
   font-family: 'Open Sans',serif;
}

Example 2: embed google font css

<link rel="stylesheet" href="//fonts.googleapis.com/css?family=Open+Sans:300,400,600,700&lang=en" />