how to add a font css google fonts code example

Example 1: add google font

CSS
@import url(https://fonts.googleapis.com/css?family=Roboto);

HTML
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto"/>

body{
  font-family: "Roboto";
}

Example 2: how to setup google fonts in html and css

font-family: '<custom_font_you_selected>', <fallback_font>