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code,
pre {
  background-color: rgba(0, 0, 0, 0.04);
  border-radius: 3px;
  font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
  padding: 3px;
}

code {
  white-space: nowrap;

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*,
*:before,
*:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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body {
  font-family: -apple-system, 
    BlinkMacSystemFont, 
    "Segoe UI", 
    Roboto, 
    Oxygen-Sans, 
    Ubuntu, 
    Cantarell, 
    "Helvetica Neue", 
    sans-serif;

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html, body {
  height: 100%;
  margin: 0;
}

body {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  display: -webkit-box;

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Here's an example of how to embed a Gist on GitHub Pages:

{% gist 5555251 %}

All you need to do is copy and paste the Gist's ID from the URL (here 5555251), and add it to a gist tag surrounded by {% and %}.

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function togglePassword() {
  let passwordInput = document.getElementById('txtPassword');
  if (passwordInput.type === 'password') {
    passwordInput.type = 'text';
  } else {
    passwordInput.type = 'password';
  }
}

(function () {

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// credit: Louis Lazaris
window.addEventListener('contextmenu', function (e) {
  console.log('context menu disabled');
  e.preventDefault();
}, false);

document.addEventListener('mouseup', function (e) {
  if (e.button === 2) {
    console.log('right-click enabled');
  }

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/* This has been added to CSS Protips https://github.com/AllThingsSmitty/css-protips */

/* The type font size in a responsive layout should be able to adjust with each viewport.
You can calculate the font size based on the viewport height and width using :root */
:root {
  font-size: calc(1vw + 1vh + .5vmin);
}

/* Now you can utilize the root em unit based on the value calculated by :root */
body {

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function css(element, property) {
  return window.getComputedStyle(element, null).getPropertyValue(property);
}

window.onload = function () {
  var span = document.createElement('span');
  
  span.className = 'fa';
  span.style.display = 'none';
  document.body.insertBefore(span, document.body.firstChild);

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<!-- source article: http://cloudinary.com/blog/automatically_art_directed_responsive_images -->

<picture>

  <!-- wide crop -->
  <source 
    media="(min-width: 600px)"
    srcset="http://res.cloudinary.com/eeeps/image/upload/c_fill,ar_2:1,g_face,f_auto,q_70,w_600/on_the_phone.jpg 600w,
            http://res.cloudinary.com/eeeps/image/upload/c_fill,ar_2:1,g_face,f_auto,q_70,w_1200/on_the_phone.jpg 1200w"
    sizes="100vw">