TX code line runs off edge of browser window

[bgorlick]

Due to having no scrolling horizontal bar on this page https://test.elementsproject.org/elements/confidential-transactions/ the TX code runs off the of the edge of the screen in browser (Chrome)

[mikelangley]

Here is some code that can be added to elements.css to fix this. It'll add scrolling to just the figure elements that run off the screen. I can do a PR but the issue is pretty minor. I just wanted to get involved.

figure.highlight {
  overflow: scroll;
  padding: 0 1em;
  box-shadow: 0 0 1px rgba(34,36,38,.15);
  border-radius: .28571429rem
}