Opening files based on Yii2

i have one problem that is i have downloaded my website from a server i have a XAMPP as a local server the question is how can i access the website throw url to see the changes i’m making inside the files while using Yii2 framework i tried to write in the url : localhost/ but i keep having this message

Access forbidden!
You don't have permission to access the requested object. It is either read-protected or not readable by the server.

If you think this is a server error, please contact the webmaster.

Error 403
Apache/2.4.29 (Win32) OpenSSL/1.0.2n PHP/7.1.12

when i installed yii2 i could get access to the application easily by writing localhost/basic in the url how to open my website in the browser please HELP ME

i downloaded the database and added it to the local data base throw php myadmin then i changed the password in the config/db.php to the same as i have for my local server it worked but it’s showing the site not the way it shows it when opening it online it’s really missed up like with no kind of css and the links and the buttons are not working and not doing anything