title: Material-ui - TextField - Can't change helper text error color
body: <p>I have a <code>form</code> with a very awkward background color. Would like to change the color of the helper text of the Outlined <code>TextField</code> when it is in an error state but can't seem to override it. It persists the red.</p>
  
  <p>See <a href="https://codesandbox.io/s/material-demo-9rppp?fontsize=14&amp;hidenavigation=1&amp;theme=dark" rel="noreferrer">CodeSandBox</a> .</p>