HTTP/1.1 403 Forbidden errors in browser console (ctrl+shift+j) mozilla firefox

I love this theme, unfortunately my blog isn’t working 100%.
I already desactivated all plugins and nothing change.

My blog works when accessing by cellphone but not in all computers. In some of them can’t see anything, slides, pages, just text are shown.
Already unninstalled Wordpress and Sydney theme and reinstalled both of them, nothing change.

Maybe Sydney is not compatible with some browser versions, but anyways, below is the console errors from CTRL+SHIFT+J in Mozilla Firefox. Any idea on how to fix these? Thanks!

GET http://www.geracaomilionaria.com/wp-content/plugins/siteorigin-panels/css/front.css [HTTP/1.1 403 Forbidden 57 ms]
GET http://www.geracaomilionaria.com/wp-content/themes/sydney/css/bootstrap/bootstrap.min.css [HTTP/1.1 403 Forbidden 51 ms]
GET http://www.geracaomilionaria.com/wp-content/themes/sydney/style.css [HTTP/1.1 403 Forbidden 55 ms]
GET http://www.geracaomilionaria.com/wp-content/themes/sydney/fonts/font-awesome.min.css [HTTP/1.1 403 Forbidden 51 ms]
Propriedade desconhecida “-moz-osx-font-smoothing”. Declaração ignorada. admin-bar.min.css:1
Propriedade desconhecida “speak”. Declaração ignorada. admin-bar.min.css:1
Erro no processamento do valor de “min-width”. Declaração ignorada. admin-bar.min.css:1
Erro no processamento do valor de “transition”. Declaração ignorada. dashicons.min.css:1
Propriedade desconhecida “-moz-osx-font-smoothing”. Declaração ignorada. dashicons.min.css:1
"JQMIGRATE: Migrate is installed, version 1.4.1" jquery-migrate.min.js:2
GET http://www.geracaomilionaria.com/wp-content/themes/sydney/js/scripts.js [HTTP/1.1 403 Forbidden 49 ms]
GET http://www.geracaomilionaria.com/wp-content/themes/sydney/js/main.min.js [HTTP/1.1 403 Forbidden 48 ms]

Hello there,

This issue isn’t theme-related. But it is usually caused by misconfiguration of wp-content (and all folder and files inside it) permissions. They should be assigned to 755. If 755 still doesn’t work on your server, try 777. Please refer to WP codex.

Regards,
Kharis