How to link background image

I need help on how I will be able to change the background image of my webpage using Css.

What have you tried so far? What problems have you had?

I had wanted to change the background image of my webpage using Css but it not working for me.

What have you tried that isn’t working?

body{background-image:url(C:\xampp\htdocs\FASTFOODJOINT\images);}

It looks like you are referencing the path of an image on the C drive of your computer. In order for an image to be seen on a website, it must be online rather than on your personal computer.