<p dir="auto">Hi,</p>
<p dir="auto">First, thank you for your effort and hard work for creating this great react component!<br>
I have an issue with the recently released beta-22 version.<br>
I had an page displaying background image using the following style:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="pageBackground: {
  background: {
    image: `url(${backgroundImg})`,
    repeat: 'no-repeat',
    size: 'cover',
    position: 'center'
  },
  height: '100% !important'
}"><pre class="notranslate"><code class="notranslate">pageBackground: {
  background: {
    image: `url(${backgroundImg})`,
    repeat: 'no-repeat',
    size: 'cover',
    position: 'center'
  },
  height: '100% !important'
}
</code></pre></div>
<p dir="auto">The background image was simply do not show anything (blank), and there are no error in the console as well. This was working fine in version beta-21. Tested using Chrome, Firefox, and Edge<br>
Using react version 16.2.0</p>
<p dir="auto">Here is the sandbox for reproducing the issue:<br>
<a href="https://codesandbox.io/s/vyl4jqmyx0" rel="nofollow">https://codesandbox.io/s/vyl4jqmyx0</a></p>
<p dir="auto">Thanks!</p>
<p dir="auto">Since JSS comes bundled in material-ui I am guessing that the problem is with your fork.</p>
<p dir="auto">When I do</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="const styles = theme =&gt; ({
  main: {
    margin: [100, 50]
  }
})"><pre class="notranslate"><code class="notranslate">const styles = theme =&gt; ({
  main: {
    margin: [100, 50]
  }
})
</code></pre></div>
<p dir="auto">I get <code class="notranslate">margin: 100px, 50px;</code> Notice the comma between the values.</p>
<p dir="auto">If id do just</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="const styles = theme =&gt; ({
  main: {
    margin: 100
  }
})"><pre class="notranslate"><code class="notranslate">const styles = theme =&gt; ({
  main: {
    margin: 100
  }
})
</code></pre></div>
<p dir="auto">it works fine</p>