How to remove white boxes from webpage?

To delete an element, simply right-click on the element you want to delete, and a popup will appear with the delete option.

REFERENCE LINK:

https://www.loom.com/share/2c2c70bf3c4240bb80f9f0da82737ebe?sid=06231ffe-5d11-4b00-8002-3f93c6ac8fec