I am trying to break down the contribution to different sub-projects using h4 and h6, it works on github-flavoured markdown but not on the site:
http://nus-oss.github.io/cs3281/teams/socketio/

HTML:

<h4 id="contribution-to-project-si">Contribution to project SI</h4>
<h6 id="main-codebase">Main codebase</h6>

illustration using github markdown support for comments:

h4

h5

h6

relevant css code on the website:

  .post-content h4, .post-content h5, .post-content h6, .post-content h7, .post-content h8 {
    font-size: 20px;
    font-family: 'Source Sans Pro', sans-serif;
    padding: 0px 10px;
    margin-bottom: 20px; }

Hi,

I would like to invite you to participate in my PhD research which is about contributing to Open Source to modernize Computer Science education. The survey will take few minutes but will be of great value to my research as i need direct evidences from OS users like you, plz, to do my research.

I hope you will be happy to participate by clicking on the related link to take the suitable survey & feel free to answer any number of questions (will be much help if you can answer all):

• Here you are the link to the student's survey: https://www.surveys.unsw.edu.au/f/161584/5d1e/
• Here you are the link to the mentor's survey: https://www.surveys.unsw.edu.au/f/161600/2b06/
• Here you are the link to the educator's survey: https://www.surveys.unsw.edu.au/f/161596/1191/
• Here you are the link to other experts & professionals from the OS industry: https://www.surveys.unsw.edu.au/f/161607/11a8/

"Please support my PhD research by circulating this invitation and mention it to your friends to reach Facebook Open Academy's educators, students, mentors & other experts & professional interested in the OS field"

Many thanks in advance,,
Nada Alasbali
PhD of Computer Science & Engineering, UNSW

The background image used in main.css (http://lakto.org/assets/img/cover.jpg) is missing.

This is what the module page looks like now (it's normal if you can't see anything):