css.xml

<!--adapted from https://github.com/Thiht/markdown-viewer/blob/master/chrome/lib/sss/sss.css-->
<style type="text/css">
body {
    color: #333;
    font-family: 'Segoe UI', 'Lucida Grande', Helvetica, sans-serif;
    line-height: 1.5;
    margin: auto;
    max-width: 1000px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: normal;
    line-height: 1em;
    margin: 20px 0;
}

h1 {
    font-size: 2.25em;
}

h2 {
    font-size: 1.75em;
}

h3 {
    font-size: 1.5em;
}

h4, h5, h6 {
    font-size: 1.25em;
}

a {
    color: #08C;
    text-decoration: none;
}

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

a:visited {
    color: #058;
}

img {
    max-width: 100%;
}

li + li {
    margin-top: 3px;
}

dt {
    font-weight: bold;
}

code {
    font-family: "Consolas", "Lucida Console", monospace;
}

pre {
    background: #EEE;
    padding: 5px 10px;
    white-space: pre-wrap;
}

pre code {
    padding: 0;
}

blockquote {
    border-left: 5px solid #EEE;
    margin: 0;
    padding: 0 10px;
}

table {
    border-collapse: collapse;
    width: 100%;
}

table + table {
    margin-top: 1em;
}

thead {
    background: #EEE;
    text-align: left;
}

th, td {
    border: 1px solid #EEE;
    padding: 5px 10px;
}

hr {
    background: #EEE;
    border: 0;
    height: 1px;
}
</style>