Remove vertical scrollbars from Jekyll syntax-highlighted code examples by adding 1px to the wrapper div height.

hide-vertical-scrollbar-in-code-example.js

var codeblocks = document.getElementsByClassName('highlight');

for (var i = 0; i < codeblocks.length; ++i) {
  var item = codeblocks[i];
  // console.log("Old height:" + " " + item.offsetHeight);
  item.style.height = item.offsetHeight + 1 + 'px';
  // console.log("New height:" + " " + item.offsetHeight);
}

style.scss

.highlight {
  overflow: auto;

  pre code {
    font-weight: normal;
    white-space: pre;
  }
}