crm/templates/pdf_base.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<link href='http://fonts.googleapis.com/css?family=Lato:300,400,700' rel='stylesheet' type='text/css'>
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<style type="text/css">
body {
font-family: 'Lato';
margin: 50px;
font-size: 16px;
};
</style>
</head>
<body>
{% block body %}{% endblock %}
</body>
</html>