title: How to change outline color of Material UI React input component?
body: <p>I've searched high and low for an answer, in both the docs and other SO questions.</p>
  
  <p>I'm using the <code>createMuiTheme</code> option in a separate JS file to override certain default styling, but am having a hard time understanding how the <code>overrides</code> option works.</p>
  
  <p>Currently my button looks like this:
  <a href="https://i.stack.imgur.com/h9PQR.png" rel="noreferrer"><img src="https://i.stack.imgur.com/h9PQR.png" alt="enter image description here"></a>
  The code I've got to get this far looks like this:</p>
  
  <pre><code>const theme = createMuiTheme({
      ...other code,
      overrides: {
      MuiFormControlLabel: {
          focused: {
              color: '#4A90E2'
          }
      },
      MuiOutlinedInput: {
          focused: {
                  border: '1px solid #4A90E2'
          },
          notchedOutline: {
              border: '1px solid #4A90E2'
          },
      },
      MuiFormLabel: {
          focused: {
              color: '1px solid #4A90E2'
          }
      }
  }
  )};
  </code></pre>
  
  <p>Then in my component, I'm using it as such:</p>
  
  <pre><code>import theme from './styles/ThemeStyles';
  import { withStyles } from '@material-ui/core/styles';
  
  class SignInForm extends Component {
  render() {
      const { classes } = this.props;
      &lt;form className={classes.container} noValidate autoComplete='off'&gt;
          &lt;TextField
              id="outlined-email-input"
              label="Email"
              className={classes.textField}
              type="email"
              name="email"
              autoComplete="email"
              margin="normal"
              variant="outlined"
          /&gt;
      &lt;/form&gt;
  }}
  </code></pre>
  
  <p>My question is, what am I missing to make my component look so funky? And in the future, how do I know what to target in the <code>overrides</code> option of the ThemeProvider so that I don't run into similar situations?</p>