Update styles to remove for Prism

[jcubic]

This fixes another error from PrismJS. Tested with "coy" style:

 ERROR  Warning: Failed prop type: Invalid props.style key `WebkitBoxSizing` supplied to
 `Text`.
Bad object: {
  "backgroundColor": "#fdfdfd",
  "position": "relative",
  "margin": 8,
  "overflow": "visible",
  "padding": "0",
  "WebkitBoxSizing": "border-box",
  "MozBoxSizing": "border-box",
  "boxSizing": "border-box",
  "marginBottom": 16
}