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A: Why is the image in div not displayed in full-size?

cjbjVisiting your site I must conclude that this is a simple case of wrong css (and hence not a WordPress problem). You have all your content in a div with class container. In your bootstrap.min.css you set the width of this container as 1170px. In style.css you define max-width:100% on images. So n...

 
so should I edit the bootstrap.min.css, or the style.css, or use a custom css? And for the sake of knowledge, where should I find the php code?
 
The php is somewhere in your theme files. If this is not your own theme you should make a child theme to put your changes in.
 
thanks, but is there a quick (and safe) way to do the fix instead?
 
The quick and dirty one is editing the css files.
But if the theme is updated you lose your edits.
 
I put it in the custom css, so it will be fine. I've tried div img { width: 1540px;} but it doesn't work
 
2:48 PM
If you don't really know how css works, the best approach is to open the development Window in your browser and try things until it works.
 
hi cjbj
in the homepage the picture does in div.container img, but it has full-size: lightninged.cards
can you have a look at that?