title: how to assign a css value for mobile and desktop in one line
body: <p>I have HTML div with width of 190 px that's working normal for desktop but for mobile its not , is there a way to tell if connection is from desktop take this value else take this value ? </p>
  
  <p>this is my code :</p>
  
  <pre><code>document.querySelector('.article').style.width ='190px';
  </code></pre>