Red payment amounts

gistfile1.js

var list = document.body.querySelectorAll('span[data-html="Amount"]');

for (i = 0; i < list.length; i++) {

  var item    = list[i];
  var content = item.innerHTML;
  var amount  = content.match(/^-[$]?/);
  // var done = amount.className += " red"

  console.log(content);
}