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Adding Classes

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About the <head>

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CSS

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HTML 

              
                <body id="homepage">
<header>
<div>
<a href="/">
<h1>The Shape of Design</h1>
<h2>Frank Chimero</h2>
</a>
</div>
<a class="menu"><div class="menu-button"></div></a>
<a href="https://buyolympia.com/q/Item=frank-chimero-the-shape-of-design-paperback" target="_blank" class="buy">Buy</a>
</header>
<article>
<main id="home">
<div class="cover">
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/884633/cover.svg" alt="The Shape of Design cover" />
</div>
<blockquote>
“If you create things, the book’s insights will inform the way you think about your work, regardless of how you make your living.”
<br>–––<br><a href="http://www.theatlantic.com/technology/archive/2012/05/design-beyond-objects-a-guide-to-making-stuff-without-focusing-on-the-stuff/256668/">The Atlantic</a>
</blockquote>
<blockquote>
“From the very first line, Frank grabs you by the neurons and heartstrings, and doesn’t let go until the very last.”
<br>–––<br><a href="https://www.brainpickings.org/2012/04/23/the-shape-of-design-frank-chimero/">Brain Pickings</a>
</blockquote>
</main>
</article>
<nav class="menu-items">
<h3>Table of Contents</h3>
<ul class="toc">
<li>
<a href="/chapters/00-foreword/">
<span></span>
Foreword
</a>
</li>
<li>
<a href="/chapters/00-introduction/">
<span></span>
Introduction
</a>
</li>
<li>
<a href="/chapters/01-how-and-why/">
<span>Chapter One</span>
How and Why
</a>
</li>
<li>
<a href="/chapters/02-craft-and-beauty/">
<span>Chapter Two</span>
Craft and Beauty
</a>
</li>
<li>
<a href="/chapters/03-improvisation-and-limitations/">
<span>Chapter Three</span>
Improvisation and Limitations
</a>
</li>
<li>
<a href="/chapters/04-form-and-magic/">
<span>Chapter Four</span>
Form and Magic
</a>
</li>
<li>
<a href="/chapters/05-fiction-and-bridges/">
<span>Chapter Five</span>
Fiction and Bridges
</a>
</li>
<li>
<a href="/chapters/06-context-and-response/">
<span>Chapter Six</span>
Context and Response
</a>
</li>
<li>
<a href="/chapters/07-stories-and-voids/">
<span>Chapter Seven</span>
Stories and Voids
</a>
</li>
<li>
<a href="/chapters/08-frameworks-and-etiquette/">
<span>Chapter Eight</span>
Frameworks and Etiquette
</a>
</li>
<li>
<a href="/chapters/09-delight-and-accommodation/">
<span>Chapter Nine</span>
Delight and Accommodation
</a>
</li>
<li>
<a href="/chapters/10-gifts-and-giving/">
<span>Chapter Ten</span>
Gifts and Giving
</a>
</li>
<li>
<a href="/chapters/11-endnotes/">
<span></span>
Endnotes
</a>
</li>
</ul>
<div class="sublinks">
<a href="/kickstarter">Backers</a>
<a href="/about">About</a>
</div>
</nav>
<footer>
By <a href="http://frankchimero.com">Frank Chimero</a> · License <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/">CC BY-NC-SA</a>
</footer>

</body>
!

CSS 

              
                /* Reset */

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}


*,*:before,*:after {
    box-sizing: border-box
}

::-moz-selection {
    background: #FFF29E
}

::selection {
    background: #FFF29E
}

html {
    font-size: 14px;
    -moz-font-feature-settings: "kern" 1, "onum" 1;
    -ms-font-feature-settings: "kern" 1, "onum" 1;
    -o-font-feature-settings: "kern" 1, "onum" 1;
    -webkit-font-feature-settings: "kern" 1, "onum" 1;
    font-feature-settings: "kern" 1, "onum" 1;
    font-kerning: normal
}

body {
    background-color: white;
    line-height: 24px;
    padding: 0;
    margin: 0 2rem;
    color: #333;
    font-family: Lyon, Georgia, serif;
    margin-bottom: 5rem
}

body#homepage {
    background: url("texture.jpg") #dfdfdf repeat;
    background-size: 100px 100px;
    background-blend-mode: multiply
}

body#homepage footer {
    border-top: none;
    margin: 0 auto
}

div.leadimg {
    background: url("texture.jpg");
    background-size: 100px 100px;
    margin: -2rem -2rem 2rem;
    height: calc(100vh - 8.5rem);
    min-height: 300px
}

div.leadimg img {
    display: block;
    padding: 5vh;
    width: 100%;
    height: 100%;
    object-fit: scale-down
}

footer {
    text-align: center;
    padding: 0.5rem 1rem 0
}

header,footer,main#home {
    font-family: 'PitchWeb', Courier, monospace
}

a {
    color: #333;
    text-decoration: none;
    background-image: linear-gradient(transparent 50%, rgba(0,0,0,0.25) 50%);
    background-position: 0px 100%;
    background-repeat: repeat-x;
    background-size: 2px 2px
}

a:hover {
    color: #b95b23
}

em {
    font-style: italic
}

article {
    margin: 2rem auto;
    padding: 0 2rem
}

article p,article h2,article h3 {
    margin: 0 auto;
    max-width: 30em;
    font-size: 20px;
    line-height: 30px;
    -moz-osx-font-smoothing: grayscale;
    -webkit-font-smoothing: antialiased;
    letter-spacing: 0.001em;
    word-spacing: 0.005em
}

article h2 {
    margin: 4rem auto;
    color: #b95b23
}

article h2 span {
    display: block;
    color: #333;
    font-family: Courier, monospace;
    font-size: 1rem;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto
}

article h3 {
    margin-bottom: 0
}

article>p+p {
    text-indent: 1.5em
}

p.block {
    text-indent: 0;
    margin-top: 2rem;
    margin-bottom: 2rem
}

p.caption {
    font-family:  Courier, monospace;
    font-size: 1rem;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto
}

p.backers {
    text-align: center
}

article img {
    width: 100%
}

article img:first-child {
    mix-blend-mode: multiply
}

article blockquote {
    margin: 4rem auto;
    font-style: italic
}

article blockquote cite {
    display: block;
    font-style: normal;
    text-transform: uppercase;
    font-size: 80%;
    letter-spacing: 0.05em
}

article ul {
    list-style: disc;
    max-width: 35rem;
    margin: 3rem auto;
    font-family: Courier, monospace;
    font-size: 1rem;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto
}

article ul li {
    padding-left: 1rem
}

article h3+ul {
    margin-top: 1rem
}

img.art {
    display: block;
    width: calc(100% - 2rem);
    margin: 4rem 1rem
}

p.forward {
    text-align: center;
    margin: 5rem auto 3rem;
    border-top: 1px solid rgba(0,0,0,0.1);
    padding-top: 3rem;
    text-indent: 0
}

a.nextchap {
    display: block;
    background-image: none;
    text-align: center
}

a.nextchap img {
    max-width: 3rem;
    text-indent: 0;
    transition: all 0.2s ease
}

a.nextchap:hover img {
    margin-left: 1rem
}

a.nextchap em,a.nextchap span {
    display: block
}

a.nextchap span {
    font-family:  Courier, monospace;
    font-size: 1rem;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto;
    text-indent: 0
}

a.buy {
    text-decoration: none;
    background-color: black;
    color: white;
    transition: all 0.1s ease;
    position: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 5em;
    height: 5em;
    border-radius: 50%;
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem
}

a.buy:hover {
    background-image: none;
    background-color: #b95b23;
    -webkit-animation: rotation 2s infinite linear
}

header {
    text-align: center;
    padding: 1.5rem 1rem;
    text-align: center;
    background-color: white;
    z-index: 100
}

header h1,header h2 {
    font-size: 1rem;
    font-weight: normal;
    display: inline;
    margin: 0
}

header a {
    background-image: none
}

header h1 {
    text-transform: uppercase
}

header h2 {
    display: none
}

nav>a {
    font-family:  Courier, monospace;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto
}

.menu-button {
    display: none;
    width: 40px;
    height: 40px;
    top: 20px;
    left: 46px;
    position: absolute
}

.menu-button:hover {
    cursor: pointer
}

.menu-button:before,.menu-button:after {
    content: '';
    width: 21px;
    height: 1px;
    background: #333;
    display: block;
    position: absolute;
    left: 5px;
    transition: all .2s ease-in-out
}

.menu-button:before {
    top: 13px
}

.menu-button:after {
    top: 22px
}

.menu-button-open:before {
    transform: rotate(45deg) translate(3px, 3px)
}

.menu-button-open:after {
    transform: rotate(-45deg) translate(4px, -3px)
}

nav {
    text-align: center;
    background-color: white;
    margin: 4rem 0;
    padding: 3rem;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee
}

nav h3 {
    font-family: Courier, monospace;
    font-size: 1rem;
    text-transform: uppercase;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto
}

nav h3:after {
    content: '';
    display: block;
    width: 4rem;
    border-bottom: 1px solid #ddd;
    margin: 2rem auto
}

.toc li {
    margin: 2.5rem 1rem
}

.toc a {
    font-size: 1.25rem;
    background-image: none
}

.toc a span {
    display: block;
    font-size: 1rem;
    font-family:  Courier, monospace;
    color: rgba(0,0,0,0.5)
}

div.sublinks {
    padding-bottom: 3rem
}

div.sublinks a {
    font-family: Courier, monospace;
    -webkit-font-smoothing: subpixel-antialiased;
    -moz-osx-font-smoothing: auto;
    display: inline-block;
    margin-right: 1.5em
}

div.sublinks a:last-child {
    margin-right: 0
}

@-webkit-keyframes rotation {
    from {
        -webkit-transform: rotate(0deg)
    }

    to {
        -webkit-transform: rotate(359deg)
    }
}

@keyframes menu-item-animation {
    0% {
        transform: translate(-300px, 0px);
        opacity: 0
    }

    100% {
        transform: translate(0px, 0px);
        opacity: 1
    }
}

main#home div.cover {
    margin: 4em 0;
    position: relative
}

main#home div.cover img {
    display: block;
    width: 100%;
    max-width: 15rem;
    margin: auto;
    border-radius: 2px 1px 1px 2px;
    mix-blend-mode: normal;
    box-shadow: 0 0 10px 0 rgba(40,42,47,0.1),-10px 10px 24px 10px rgba(40,42,47,0.05),-30px 40px 30px 0 rgba(40,42,47,0.1),-10px 10px 10px -5px rgba(40,42,47,0.1)
}

main#home blockquote {
    text-align: center;
    margin: 2rem auto;
    max-width: 25em;
    font-style: normal
}

main#home blockquote a {
    text-transform: uppercase
}

@media (max-width: 800px) {
    body {
        margin:0
    }
}

@media (min-width: 500px) {
    header h2 {
        display:inline
    }

    header h2:before {
        content: ' · '
    }
}

@media (min-width: 800px) and (max-height: 600px) {
    header h2 {
        display:none
    }
}

@media (min-width: 800px) {
    html {
        margin-left:4.5rem
    }

    div.leadimg {
        margin-left: -4.5rem;
        height: calc(100vh - 6rem)
    }

    a.buy {
        right: 2rem;
        top: 2rem;
        width: 5em;
        height: 5em
    }

    header {
        position: fixed;
        top: 0;
        left: -2rem;
        bottom: 0;
        display: flex;
        align-items: center;
        width: 7rem;
        border-right: 1px solid #eee
    }

    header>div {
        transform: rotate(90deg);
        transform-origin: top left;
        position: absolute;
        left: 5rem;
        top: calc(50vh - 12rem);
        line-height: 1;
        width: 24rem;
        height: 2em
    }

    .menu-button {
        display: block;
        margin-left: 2px
    }

    .menu-items {
        position: fixed;
        top: 0;
        bottom: 0;
        left: calc(5rem - 300px);
        margin: 0;
        max-width: 300px;
        z-index: 4;
        transition: all .3s ease-in-out;
        border-right: 1px solid #f0f0f0;
        border-top: none;
        border-bottom: none;
        overflow-y: auto
    }

    .menu-items-open {
        left: 5rem;
        transition: all .3s ease-in-out
    }

    footer {
        max-width: 43rem;
        margin: 0 auto;
        border-top: 1px solid rgba(0,0,0,0.1);
        text-align: center;
        padding: 4rem 1rem 0
    }

    body#homepage {
        margin-bottom: 0
    }

    body#homepage footer {
        margin-top: 0;
        margin-bottom: 0;
        padding-top: 0
    }

    main#home {
        display: flex;
        align-items: center;
        justify-content: space-around;
        height: calc(100vh - 9rem);
        margin: 0 auto;
        max-width: 70rem
    }

    main#home blockquote {
        width: 25%;
        padding: 0 1rem
    }

    main#home blockquote:first-child {
        order: 1
    }

    main#home div.cover {
        width: calc(40% + 4rem);
        order: 2;
        padding: 0 2rem
    }

    main#home div.cover img {
        display: block;
        margin: 0 auto;
        width: auto;
        max-width: 28vw;
        max-height: calc(100vh - 12rem);
        object-fit: contain
    }

    main#home blockquote:last-child {
        order: 3
    }
}

@media (min-width: 1200px) {
    body:not(#homepage) {
        margin-left:calc(50vw - 5rem);
        padding: 4rem 2rem 0
    }

    div.leadimg {
        background: url("texture.jpg");
        background-size: 100px 100px;
        position: fixed;
        left: 5rem;
        top: 0;
        bottom: 0;
        height: 100vh;
        margin: 0;
        width: calc(50vw - 5rem);
        background-color: #fff
    }

    div.leadimg img {
        display: block;
        padding: 2rem;
        width: 100%;
        height: 100vh;
        object-fit: scale-down
    }

    footer {
        margin: 4rem 2rem 0;
        border-top: 1px solid rgba(0,0,0,0.1);
        text-align: center;
        padding: 4rem 1rem 0
    }

    main#home div.cover {
        width: calc(50% + 4rem);
        order: 2;
        padding: 0 2rem
    }

    main#home div.cover img {
        max-width: 38vw;
        max-height: calc(100vh - 12rem);
        object-fit: contain
    }
}
!

JS 

              
                $( document ).ready(function() {
    $( '.menu-button' ).click(function() {
      $( ".menu-button" ).toggleClass('menu-button-open');
      $( ".menu-items" ).toggleClass('menu-items-open');
    });
  });
!
999px

Console