title: How to change the underline and label color of Material-UI <Select/>
body: <p>I used this demo to change the colours of some input fields: <a href="https://stackblitz.com/edit/material-ui-custom-outline-color" rel="nofollow noreferrer">https://stackblitz.com/edit/material-ui-custom-outline-color</a></p>
  <p>I was wondering if anyone had a similar demo for when they've changed the colour of their select components from material UI? Or some instructions on how to go about doing it (I've looked at the docs already but am struggling to follow them).</p>
  <p>Thank you!</p>