I want to use an image as the background of a website, but the background is not reflected in any image.

Source code
<! doctype html>
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <style type = "text/css">
            body {
            background-image: url (original.gif);

In this source code it is a gif, but I had a similar problem with another jpg file. Also, the image files are in the same folder as the HTML.

Tools used

I used brackets.