Add a box shadow to a card-like element

Add a box shadow to a card-like element
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#1

i dont understand what im to do at this stage.especially the part where it says ‘your code should add a box-shadow property for the thumbnail id’. i dont even know what the thumbnail is.


#2

Can you give a link to the exercise?


#3

Add the #thumbnail id selector to the CSS and then copy paste the box-shadow code from the challenge text.