custom.css

@import url('http://fonts.googleapis.com/css?family=Open+Sans:400,300,300italic,400italic,600,600italic,700,800,700italic');
@import url('http://fonts.googleapis.com/css?family=Roboto+Slab:400,100,300,700');
@import url('http://fonts.googleapis.com/css?family=Source+Serif+Pro');

html {
	font-size: 62.5%;
}

#notebook_panel { /* main background */
	background: #f0f0f0;
}

div.cell {
	width: 90%;
	margin-left: auto;
	margin-right: auto;
}
div.cell.selected {
	border-color: #f5f5f5;
}

div #notebook { /* centre the content */
	background: #fff; /* white background for content */
	/* set cell width to about 80 chars */
	width: 65%;
	margin-left: auto;
	margin-right: auto;
}
#notebook .container {
	width: 100%;
}


/* draw border around running cells */
div.cell.border-box-sizing.code_cell.running { 
	border: 3px solid #333;
}

/* Put a solid color box around each cell and its output, visually linking them together */
div.cell.code_cell {
/*    background-color: #f4f3e0; */
/*    border-radius: 10px; */
/*    padding: 1em;*/
/*    margin-top: 1em;*/
}


/* Formatting for header cells */
div.text_cell_render h1 {
	font-family: 'Open Sans', sans-serif;
	font-weight: 100;
	font-size: 3.6rem;
	line-height: 100%;
/*	margin-bottom: 0.1rem;*/
/*	margin-top: 0.1rem;*/
	color: #3f3f3f;
	display: block;
}	

div.text_cell_render h2 {
	font-family: 'Open Sans', sans-serif;
	font-weight: 100;
	font-size: 3.2rem;
	line-height: 100%;
	color: #cc0000;
/*	margin-bottom: 0.1rem;*/
/*	margin-top: 0.1rem;*/
	display: block;
}	

div.text_cell_render h3 {
	font-family: 'Open Sans', sans-serif;
	font-weight: 100;
	font-size: 4.8rem;
/*	margin-top:12px;*/
/*	margin-bottom: 3px;*/
	color: #3f3f3f;
}

div.text_cell_render h4 {
	font-family: 'Open Sans', sans-serif;
	font-weight: 100;
	font-size: 2.2rem;
	line-height: 100%;
	color: #3f3f3f;
/*	margin-bottom: 0.1rem;*/
/*	margin-top: 0.1rem;*/
	display: block;
}

div.text_cell_render h5 {
	font-family: 'Open Sans', sans-serif;
	font-weight: 100;
	font-size: 1.9rem;
	line-height: 100%;
	color: #3f3f3f;
/*	margin-bottom: 0.1rem;*/
/*	margin-top: 0.1rem;*/
	display: block;
}

div.text_cell_render h6 {
	font-family: 'Open Sans', sans-serif;
	font-weight: 100;
	font-size: 1.7rem;
	line-height: 100%;
	color: #3f3f3f;
/*	margin-bottom: 0.1rem;*/
/*	margin-top: 0.1rem;*/
	display: block;
}

div.text_cell_render {  
	color: #404040;
	font-family: 'Roboto Slab', Baskerville, Georgia, serif;
	font-size: 1.6rem;
	line-height: 2.6rem; /* added for some line spacing of text. */
}

.CodeMirror pre {
    font-family: 'Source Code Pro', Consolas, monocco, monospace;
}

.text_cell_render table > td {
	text-align: left;
	vertical-align: top;
	padding: 1rem 0 4rem 0;
	margin-bottom: 1em;
	border-top: 1px solid #efefef;
}


.math,
.MathJax_Display {
	color: #05b9ff;
}

.text_cell_render .theorem {
	padding: 3rem;
	margin: auto;
	border: 1px solid #05b9ff;
}

.text_cell_render ol.alpha > li  {
	list-style-type: upper-alpha;
}

.text_cell_render ol.roman > li {
	list-style-type: upper-roman;
}

.text_cell_render table {
	margin-top: 4rem;
}

.text_cell_render table,
.text_cell_render table tr,
.text_cell_render table td
{
	border: 0;
	border-left: 0;
	border-right: 0;
	border-bottom: 0;
}

.text_cell_render table td {
	text-align: left;
	vertical-align: top;
	padding: 1rem 0 4rem 0;
	margin-bottom: 1em;
	border-top: 1px dotted #e2e2e2;
}

.text_cell_render table.no-border {
	margin-top: 0;
}
.text_cell_render table.no-border td {
	border-top: none;
}

/** Custom counters for Ordered List elements **/
@counter-style cs-alphabetic {
  system: alphabetic;
  symbols: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z;
  suffix: ") ";
}

.text_cell_render ol.outline li span.section::before {
	content: "Section: ";
}
.text_cell_render ol.outline li span.section,
.text_cell_render ol.outline li span.section::before {
	font-weight: bold;
}

/** -------------------------------------------------------------------- **/
/** Media Queries
 * Modify notebook layout based on parameters like screen width, etc.
 */

/** If the width of the viewport (i.e. browser window) is less 
  * than 1000px, let the content container consume more horizontal
  * space.
  */

@media all and (max-width: 800px) {
	div #notebook { width: 95%; }
	
	#notebook .container {
		width: 100%;
	}
}