higher resolution for background images

How can I achieve a higher resolution for background images? When I add images I sometimes use this:


<img src="/wp-content/uploads/2024/02/test-1.png" width="300" height="300"/>

The photo is 600x600 and I just set the size to 300x300. The picture is super sharp. 

However, this is not possible with the section settings. What am I doing wrong? Or what can I do? 


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