aeropython.css

/* This template is inspired in the one used by Lorena Barba
in the numerical-mooc repository: https://github.com/numerical-mooc/numerical-mooc
We thank her work and hope you also enjoy the look of the notobooks with this style */

<link href='http://fonts.googleapis.com/css?family=Source+Sans+Pro|Josefin+Sans:400,700,400italic|Ubuntu+Condensed' rel='stylesheet' type='text/css'>

El estilo se ha aplicado =)

<style>



#notebook_panel { /* main background */
    background: #f7f7f7;
}

div.cell { /* set cell width */
    width: 900px;
}

div #notebook { /* centre the content */
    background: #fff; /* white background for content */
    width: 950px;
    margin: auto;
    padding-left: 0em;
}

#notebook li { /* More space between bullet points */
    margin-top:0.7em;
}

/* draw border around running cells */
div.cell.border-box-sizing.code_cell.running { 
    border: 1px solid #111;
}

/* Put a solid color box around each cell and its output, visually linking them*/
div.cell.code_cell {
    font-family: 'Source Sans Pro', sans-serif;
    background-color: rgb(256,256,256);
    font-size: 110%;
    border-radius: 0px; 
    padding: 0.5em;
    margin-left:1em;
    margin-top: 1em;
}

div.text_cell_render{
    font-family: 'Josefin Sans', serif;
    line-height: 145%;
    font-size: 125%;
    font-weight: 500;
    width:750px;
    margin-left:auto;
    margin-right:auto;
}


/* Formatting for header cells */
.text_cell_render h1, .text_cell_render h2, .text_cell_render h3,
.text_cell_render h4, .text_cell_render h5 {
    font-family: 'Ubuntu Condensed', sans-serif;
}
/*
.text_cell_render h1 {
    font-family: Flux, 'Ubuntu Condensed', serif;
    font-style:regular;
    font-weight: 400;    
    font-size: 30pt;
    text-align: center;
    line-height: 100%;
    color: #335082;
    margin-bottom: 0.5em;
    margin-top: 0.5em;
    display: block;
}
*/
.text_cell_render h1 {
    font-weight: 600;
    font-size: 35pt;
    line-height: 100%;
    color: #000000;
    margin-bottom: 0.1em;
    margin-top: 0.3em;
    display: block;
}

.text_cell_render h2 {
    margin-top:16px;
    font-size: 27pt;
    font-weight: 550;
    margin-bottom: 0.1em;
    margin-top: 0.3em;
    font-style: regular;
    color: #2c6391;
}	

.text_cell_render h3 {
    font-size: 20pt;
    font-weight: 550
    text-align: left;
    margin-bottom: 0.1em;
    margin-top: 0.3em;
    font-style: regular;
    color:  #387eb8;
}

.text_cell_render h4 {    /*Use this for captions*/
    font-size: 18pt;
    font-weight: 450
    text-align: left;
    margin-bottom: 0.1em;
    margin-top: 0.3em;
    font-style: regular;
    color:  #5797cc;
}

.text_cell_render h5 {  /*Use this for small titles*/
    font-size: 18pt;
    font-weight: 550;
    color: rgb(163,0,0);
    font-style: italic;
    margin-bottom: .1em;
    margin-top: 0.8em;
    display: block;
    color:  #b21c0d;
}

.text_cell_render h6 { /*use this for copyright note*/
    font-family: 'Ubuntu Condensed', sans-serif;
    font-weight: 300;
    font-size: 14pt;
    line-height: 100%;
    color: #252525;
    text-align: right;
    margin-bottom: 1px;
    margin-top: 1px;
}

.CodeMirror{
        font-family: 'Duru Sans', sans-serif;
        font-size: 100%;
}

</style>
<script>
    MathJax.Hub.Config({
                        TeX: {
                           extensions: ["AMSmath.js"],
                           equationNumbers: { autoNumber: "AMS", useLabelIds: true}
                           },
                tex2jax: {
                    inlineMath: [ ['$','$'], ["\\(","\\)"] ],
                    displayMath: [ ['$$','$$'], ["\\[","\\]"] ]
                },
                displayAlign: 'center', // Change this to 'center' to center equations.
                "HTML-CSS": {
                    styles: {'.MathJax_Display': {"margin": 4}}
                }
        });
</script>