The fonts can be added in app/fonts folder.

After you done that you will need to specify in your css (app/style/scss/_vars.scss) the font’s family.

This is how the SCSS code should look like:

/* fonts */
$defaultFont: 'Open Sans',sans-serif;
$menuFont: 'Montserrat', sans-serif;
$titleFont: 'Amatic SC', cursive;
$mapFont: 'Roboto', sans-serif;

The fonts are loaded in the header of each HTML file

<!-- Fonts -->
<link href="//fonts.googleapis.com/css?family=Amatic+SC:400,700%7CMontserrat:400,700%7COpen+Sans:300,400%7CRoboto" rel="stylesheet">
<link rel="stylesheet" href="fonts/icomoon/style.css"></head>