title: Changing the Material UI's DatePicker's border color
body: <p><a href="https://i.stack.imgur.com/ZvNOA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZvNOA.png" alt="enter image description here" /></a></p>
  <p>This is my DatePicker from material UI, the only thing I want is to change borderColor. I've tried classes, changing the theme's primary color, using WithStyles.. Nothing seems to work.</p>