Joomla 5, No Responsive scaling of images in articles

I'm having an Issue with responsive scaling of image in an Article.
Have used the css for the Header-logo :
.imglogo img {
    width: 100%;
}
which works fine.

Please see example here:  maxbf.dk/index.php/en/
If I use the Cassiopeia-template it works.

Thank You very much in advance

Best regards
Ole Fisker

That rule you have only works for the logo in the header (imglogo). If you want it to apply to any image, you have to remove the ".imglogo" part and only keep the "img".
But that may or may not tamper with other images on the page.
The better approach would be to add a CSS Class to your image. If you add "img-fluid" to that picture, it will automatically scale to the screen size.

Hi Thomas

Thank You very much, I really appreciate Your help  
You do always have usefull suggestions.

I have startet with Your first solution, which seems to work like a charm. It seems to be the easiest, don't have to remember to insert the CSS when using an image.
But I can't figure out if the first solution can result in some unforseen issues in the future.

Best regards
Ole

Just keep it in mind if a picture doesn't behave as expected. Then you have to change the rule