index.css

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: #222;
    font-size: 100%;
}

.slide {
    position: absolute;
    top: 0; bottom: 0;
    left: 0; right: 0;
    background-color: #f7f7f7;
}

.slide-content {
    width: 800px;
    height: 600px;
    overflow: hidden;
    margin: 80px auto 0 auto;
    padding: 30px;

    font-weight: 200;
    font-size: 200%;
    line-height: 1.375;
}

.controls {
    position: absolute;
    bottom: 20px;
    left: 20px;
}

.arrow {
    width: 0; height: 0;
    border: 30px solid #333;
    float: left;
    margin-right: 30px;

    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.prev {
    border-top-color: transparent;
    border-bottom-color: transparent;
    border-left-color: transparent;

    border-left-width: 0;
    border-right-width: 50px;
}

.next {
    border-top-color: transparent;
    border-bottom-color: transparent;
    border-right-color: transparent;

    border-left-width: 50px;
    border-right-width: 0;
}

.prev:hover {
    border-right-color: #888;
    cursor: pointer;
}

.next:hover {
    border-left-color: #888;
    cursor: pointer;
}

h1 {
    font-size: 300%;
    line-height: 1.2;
    text-align: center;
    margin: 170px 0 0;
}

h2 {
    font-size: 100%;
    line-height: 1.2;
    margin: 5px 0;
    text-align: center;
    font-weight: 200;
}

h3 {
    font-size: 140%;
    line-height: 1.2;
    border-bottom: 1px solid #aaa;
    margin: 0;
    padding-bottom: 15px;
}

ul {
    padding: 20px 0 0 60px;
    font-weight: 200;
    line-height: 1.375;
}

.author h1 {
    font-size: 170%;
    font-weight: 200;
    text-align: center;
    margin-bottom: 30px;
}

.author h3 {
    font-weight: 100;
    text-align: center;
    font-size: 95%;
    border: none;
}

a {
    text-decoration: none;
    color: #44a4dd;
}

a:hover {
    color: #66b5ff;
}

pre {
    font-size: 60%;
    line-height: 1.3;
}

.progress {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 3px;
    z-index: 1;
}

.progress-bar {
    width: 0%;
    height: 3px;
    background-color: #b4b4b4;

    -webkit-transition: width 0.05s ease-out;
    -moz-transition: width 0.05s ease-out;
    -o-transition: width 0.05s ease-out;
    transition: width 0.05s ease-out;
}

.hidden {
    display: none;
}

@media (max-width: 850px) {

    body {
        font-size: 70%;
    }

    .slide-content {
        width: auto;
    }

    img {
        width: 100%;
    }

    h1 {
        margin-top: 120px;
    }

    .prev, .prev:hover {
        border-right-color: rgba(135, 135, 135, 0.5);
    }

    .next, .next:hover {
        border-left-color: rgba(135, 135, 135, 0.5);
    }
}

@media (max-width: 480px) {
    body {
        font-size: 50%;
        overflow: hidden;
    }

    .slide-content {
        padding: 10px;
        margin-top: 10px;
        height: 340px;
    }

    h1 {
        margin-top: 50px;
    }

    ul {
        padding-left: 25px;
    }
}

@media print {
    * {
        -webkit-print-color-adjust: exact;
    }

    @page {
        size: letter;
    }

    .hidden {
        display: inline;
    }

    html {
        width: 100%;
        height: 100%;
        overflow: visible;
    }

    body {
        margin: 0 auto !important;
        border: 0;
        padding: 0;
        float: none !important;
        overflow: visible;
        background: none !important;
        font-size: 52%;
    }

    .progress, .controls {
        display: none;
    }

    .slide {
        position: static;
    }

    .slide-content {
        border: 1px solid #222;
        margin-top: 0;
        margin-bottom: 40px;
        height: 3.5in;
        overflow: visible;
    }

    .slide:nth-child(even) {
        /* 2 slides per page */
        page-break-before: always;
    }
}

strong {
    font-weight: bold;
}

img {
    display: block;
    margin: 20px auto;
}