title: Rails background image not show?
body: <p>In my rails app file: <code>application.scss</code>, I set like following: (I want <code>backtest.png</code> shows in any page.)</p>
  
  <pre><code>body 
    {
      background-image: image-url("backtest.png");
      background-size: 100%;
      background-repeat: repeat-y; 
  
      padding-top: 60px;
      padding-bottom: 70px;
      text-align: center;
    }
  </code></pre>
  
  <p>and in <code>login.html.erb</code>, I want to show another image:</p>
  
  <pre><code>body {
        background-image: url('/assets/iot.png');
        width: 100%;
        height: 100%;
    }
  </code></pre>
  
  <p>at local side, I use rails server to display, and it's fine, but when I upload to Nginx, the <code>backtest.png</code> still OK, but <code>iot.png</code> doesn't show, even not show <code>backtest.png</code>, just a white color background? How can I fix that?</p>
  
  <p>I had do <code>assets:clean</code>, <code>assets:precompile</code> ever when I push new version.</p>
  
  <p>config/deploy/environments/production.rb:</p>
  
  <pre><code>config.assets.js_compressor = :uglifier
  config.assets.compile = false
  config.assets.digest = true
  </code></pre>
  
  <p>tried both change to <code>background-image: url</code>, and two images not show, tried <code>background-image: url('/assets/iot.png');</code> to <code>image-url</code>, but it not work on <code>.erb</code>.</p>