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Mirali Mirzayev1,980 Points
The Great Community Please Show me what i am doing wrong Thank you!
const body = document.getElementsByClassName('body');
Haisam Elkewidy26,987 Points
What you are looking for is:
const body = document.getElementsByTagName('body');
because getElementsByTagName returns a collection of HTML elements. The body element is the very first element in the collection, which is why you use the  at the end of it. It's essentially an index of 0 in the entire collection.
Hope this helps you.