Hey!
in order to make my website responsive I added this link !
https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0/css/bootstrap.css
which then showed all these green boxes which I didn’t recognize what they are !
so what can I do please to solve it out ! 
https://codepen.io/fatimazahra/pen/JvxRyO?editors=1100
Hello,
Your own CSS and Bootstrap are conflicting with each other. This is because Bootstrap is based on CSS.
Hope this helps.
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yeah I guess I mixed up many tings cause I tried to watch other tutorials to finish it up, and ended this way ! thanks v. much 