Drupal 8.x

Hi, this may be a naive question as I'm a real beginner to web development. I built a blog website using Drupal 8, and downloaded and installed a theme. I would like to modify the theme, as I want to make the site title smaller and the navigation menu bigger. I first used the browser's inspect element tool to modify the CSS, which did exactly what I wanted. However, when I attempted to modify the style.css file and upload the modified version to the server, my changes did not take effect.

Hello and sorry for my bad English. I am using Drupal 8 and i want to make a menu with categories. The menu title has to be CATEGORIES and when someone click on it, the menu has to show the categories with a drop down. So i've created categories. Then i created a menu called - CATEGORIES and i marked "show as expanded". In the menu link i added - route:<nolink> . So now i have Categories menu with drop down listing categories, but when i click on it, the page is refreshed. I dont whant the page to be refreshed everytime i clikc on CATEGORIES.

Hello and sorry for my bad English. I am using Drupal 8 and i want to make a menu with categories. The menu title has to be CATEGORIES and when someone click on it, the menu has to show the categories with a drop down. So i've created categories. Then i created a menu called - CATEGORIES and i marked "show as expanded". In the menu link i added - route:<nolink> . So now i have Categories menu with drop down listing categories, but when i click on it, the page is refreshed. I dont whant the page to be refreshed everytime i clikc on CATEGORIES.

I have a site with Drupal 8 and I activate English and French (Language from the URL path prefix). Here is what my url resembles :

https://www.domaine.com/en/node/add
https://www.domaine.com/fr/node/add

And here is the current configuration of my robots.txt file :

https://www.drupal.org/project/date_recur

I have the old version working (on the live website) fine but since the update (on the test website) it is not running, I have everything setup how I want it, but when I enter a Start Date/End Date and save the changes, go back and open the same event it has not saved the dates it is still showing the default ddmmyy etc.

Has anyone got the latest version running

I am using Drupal 8.6.7

Thanks