Note this only works for webkit browsers (Chrome and Safari). Here's how you make your own custom scrollbar...

  1. Set html to overflow: auto
  2. Set body to overflow-y: scroll
  3. Create a div with a height larger than the window (just for testing)
  4. Set a width for ::-webkit-scrollbar
  5. Set a background-color for ::-webkit-scrollbar-track
  6. Set a background-color for ::-webkit-scrollbar-thumb

Optional: Put a border-radius on the scrollbar and track for a nicer look