When installing ProcessWire out of the box (Softaculous), there is one minor mistake in making it truly https friendly.
site/templates/_main.php - the http: has to be removed in order to load the google font accordingly to the site setup https/http.
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title><?php echo $title; ?></title>
<meta name="description" content="<?php echo $page->summary; ?>" />
<link href='http://fonts.googleapis.com/css?family=Lusitana:400,700|Quattrocento:400,700' rel='stylesheet' type='text/css' />
<link rel="stylesheet" type="text/css" href="<?php echo $config->urls->templates?>styles/main.css" />
</head>
Great product! Continue the brilliance.