CSS Background Shorthand property not work?

 **CSS**

Why my CSS Background Shorthand Property does not work .I have applied many processes ,But it’s not working.

      **CSS stylesheet**
        *{
            padding: 0;
            margin: 0;
        }
        .container{
            width: 800px;
            height: 800px;
            margin: 0 auto;
            border: solid 2px;
            background: red url(image/computer.png) no-repeat cover fixed;
        }
   
   **HTML code**
        <div class="container">
    
        </div>

>Solution :

Two problems you have to fixed:

You doesn’t have the "" for the url.

You have to separately set the background-size:cover property.

Set it in the background will not work.

*Not sure if image/computer.png is a local image or an invalid image. If it is a local image, just replace the url back (I change the url to wikipedia icon for showing purpose)

*{
         padding: 0;
            margin: 0;
        }
        .container{
            width: 800px;
            height: 800px;
            margin: 0 auto;
            border: solid 2px;
            background: red url("https://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Wikipedia-logo-v2.svg/2244px-Wikipedia-logo-v2.svg.png")  0 0 no-repeat fixed;
           
        }

<div class="container">
    
        </div>