Answer 1

try using the search bar before posting any questions.

do you know how to attach a image as background?
well if you don't, here it is:

https://www.w3schools.com/cssref/pr_background-image.asp

https://www.w3schools.com/html/html_images_background.asp

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And for using a image of your phone:

https://www.sololearn.com/post/10362/?ref=app

https://www.sololearn.com/post/459751/?ref=app

https://www.sololearn.com/Discuss/2281884/?ref=app

https://www.sololearn.com/Discuss/2390690/?ref=app