Laravel registering routes affecting CSS - css

Question

I am using Laravel 6 and want to change the structure of some of my routes in the web.php file. When registering the following route like this:
Route::view('/my-article', 'articles.my-article')->name('my-article');
everything works as it should.
But when changing the URL like this, adding /articles:
Route::view('/articles/my-article', 'articles.my-article')->name('my-article');
Suddenly no CSS is applied anymore. No Bootstrap, Fontawesome or own stylesheet. JS script on the other hand, and HTML of course, were loaded.
Oddly (for me): The other routes worked fine, all CSS stylesheets loaded.
I tried the same with another route that had a Controller action. I changed it from
Route::get('/{continent}', 'ContinentController#index')->name('continent');
to (adding /continents)
Route::get('/continents/{continent}', 'ContinentController#index')->name('continent');
And again, no styles were applied. Only JS scripts and HTML.
Why is that so? Why can't I add something to the URL by hand and why does it affect the loading of the CSS stylesheets?
Thanks and best regards.
EDIT:
Here is the part of my template.blade.php file where the styles are included:
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<!-- Font Awesome Icons CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<!-- Own CSS -->
<link rel="stylesheet" href="css/style.css?{{ time() }}">