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Usually div placed inside other div takes all available space, if it is overflowing the boundaries of parent div, that means you gave him additional styles that caused it. Perhaps you did width:… or something like this.

Correct your custom rules and it will be contained inside the article area.

Ok, I succed in responsive div, when there is a unique large div ( with:100%; height:100%). But when there are two div side by side I don’t know which parameters have I to put as regards width and height (www.nonmarketing.it. Tks

Try to do width 50% and give float to one or both divs.

Read more at:

https://www.elated.com/articles/css-positioning/

https://www.goshen.edu/physix/385/pub/css2.php