title: Overriding the material-UI style not working
body: <p>I am new to the material UI. Here, I am trying to override the CSS of material UI <code>tabs component.</code></p>
  
  <pre><code>&lt;Tab
      key={`${tab}_${index}`}
      classes={{
      flexcontainer: css.tabFlexContainer
      }}
      disableRipple
      label={tab.label}
      value={tab.value}
      icon={
      tab.icon ? &lt;Icons className={css.tabIcons} iconname={tab.icon} /&gt; : null
      }
  /&gt;
  </code></pre>
  
  <p>So, here I am trying to override the <code>flexContainer</code> class with this CSS: </p>
  
  <pre><code>. tabFlexContainer {
     width : 100%
    justify -content :space-between
  }
  </code></pre>
  
  <p>So, when I am using I am getting a compiled time error only,</p>
  
  <blockquote>
    <p>TS2769: No overload matches this call.</p>
  </blockquote>
  
  <p>Can anyone help me with this?</p>