main.css

html {
    background: #f7f7f7;
    color: #333;
    font: 16px/1.4 Open Sans, Helvetica, Arial, sans-serif;
}

body {
    max-width: 720px;
    padding: 20px 40px;
    margin: 0 auto;
}

a {
    color: #069;
    text-decoration: none;
}

a:hover,
a:focus,
a:active {
    text-decoration: underline;
}

h1,
h2 {
    line-height: 1.2;
}

p {
    margin: 1em 0;
}

/* structure */

.site-box {
    padding: 40px 60px 0;
    border: 1px solid #ccc;
    margin: 0 0 3em;
    background: #fff;
    text-align: center;
}

.site-footer {
    width: 85%;
    margin: 0 auto;
}

.logo {
    margin: 0 0 1em;
    font-size: 2.375em;
    color: #69a619;
    text-transform: lowercase;
    text-shadow: 1px 1px 0 #304d08;
    text-decoration: none;
}

.tagline {
    margin: 0 0 0.75em;
    font-size: 2.25em;
}

/**
 * Calls to action
 */

.cta-option {
    position: relative;
    display: inline-block;
    /* IE6/7 inline-block hack */
    *display: inline;
    *zoom: 1;

    margin: 1.5em 0.75em 0.5em;
    vertical-align: bottom;
}

/**
 * Download button
 */

.btn-download {
    position: relative;
    display: inline-block;
    /* IE6/7 inline-block hack */
    *display: inline;
    *zoom: 1;

    padding: 0.4em 1em;
    border: 1px solid #5e9612;
    margin: 0 0 10px;
    color: #fff;
    background: #69a619;
    border-radius: 4px;
    box-shadow: 0 2px 5px -2px #111, inset 0 2px 5px 0 rgba(255, 255, 255, 0.3);
    font-size: 1.5em;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
}

.btn-download:hover,
.btn-download:focus,
.btn-download:active {
    background: #6ead1a;
    text-decoration: none;
}

.btn-download:active {
    box-shadow: inset 0 2px 3px 0 rgba(0, 0, 0, 0.2);
    background: #5d9117;
}

/**
 * Alternative download button
 *
 * @extends .btn-download
 */

.btn-download-alt {
    border-color: #ccc;
    background: #eee;
    box-shadow: none;
    color: #666;
    font-size: 1.25em;
}

.btn-download-alt:hover,
.btn-download-alt:focus,
.btn-download-alt:active {
    background: #f5f5f5;
}

.btn-download-alt:active {
    background: #ddd;
}

/**
 * Share bar
 */

.share-bar {
    overflow: hidden;
    padding: 15px 30px;
    border-top: 1px solid #ddd;
    margin: 50px -60px 0;
    background: #eee;
    line-height: 28px;
    *zoom: 1;
}

.share-opt {
    float: left;
    height: 28px;
    margin: 0 15px 0 0;
}

.read-more {
    float: right;
}

/**
 * Utilities
 */

.txt-small {
    font-size: 0.75em;
}

.txt-large {
    font-size: 1.25em;
}

.txt-mute {
    color: #999;
}

@media screen and (max-width: 700px) {
    .read-more {
        float: none;
        display: block;
        margin: 0 0 1em;
        line-height: 1.2;
    }
}

@media screen and (max-width: 540px) {
    body {
        padding: 20px;
        font-size: 0.875em;
    }

    .site-box {
        padding: 30px 30px 0;
    }

    .cta-option {
        margin-left: 0;
        margin-right: 0;
    }

    .share-bar {
        margin-left: -30px;
        margin-right: -30px;
        text-align: center;
    }

    .share-opt {
        float: none;
        display: inline-block;
        margin: 0 1em 0.5em;
    }
}