title: why does my background image doesn't show?
body: <p>I have a problem which is my background image doesn't show up. I am sure that my url is correct (Because I have used this url in other aspects).</p>
  
  <p>This is my css file:</p>
  
  <pre><code>body{
      background : url(assets/image/main.jpg);
  
      background-size: cover;
  
  
  }
  </code></pre>
  
  <p>so what happened?</p>
  
  <p>This is my folder's structure:</p>
  
  <pre><code>/assets/
        css/
           style.css
        image/
           main.jpg
  /index.html
  </code></pre>