Getting started

GitHub Pages can automatically generate and serve the website for you. Let’s say you have a username/organisation my-org and project my-proj; if you locate Jekyll source under blog folder of master branch in your repo, the website will be served on

  1. Just download or fork and clone the source from
  2. Make sure your local machine has ruby and node
  3. Edit site settings in _config.yml file according to your project.
  4. Replace favicons and _includes/logo.svg with your own logo.

Note that you might have to adjust some CSS depending on the width and height of your logo. You can find Header / Navigation related SCSS in _sass/layout/nav.scss.

Writing content


Create a new Markdown file such as in _post folder. Configure YAML Front Matter (stuff between ---):

layout: post # needs to be post
title: Getting Started with Sleek # title of your post
featured-img: sleek #optional - if you want you can include hero image


In case you want to add a hero image to the post, apart from changing featured-img in YAML, you also need to add the image file to the project. To do so, just upload an image in .jpg format to _img folder. The name must before the .jpg file extension has to match with featured-img in YAML. Next, run gulp img from command line to generate optimized version of the image and all the thumbnails. You have to restart the jekyll server to see the changes. Sleek uses Lazy Sizes Lazy Loader for loading images. Check the link for more info. Lazy Sizes doesnt’t require any configuration and it’s going to be included in your bundled js file.


The home page is located under file. To change the content or design you have to edit the default.html file in _layouts folder.

In order to add a new page, create a new html or markdown file under root directory or inside _pages folder. To add a link to the page, edit navigation setting in _config.yml.

Images TODO

Introduce gulp optimization

BreakpointImage TypeWidthRetina
xsPost Thumb535px1070px
smPost Thumb500px1000px
mdPost Thumb329.375px658.75px
lgPost Thumb445.625px891.25px
xlPost Thumb353.125px706.25px
BreakpointImage TypeWidthRetina
xsPost Hero535px1070px
smPost Hero500px1000px
mdPost Hero329.375px658.75px
lgPost Hero445.625px891.25px
xlPost Hero353.125px706.25px


If you want to use MathJax in your posts, add mathjax: true in YAML front matter of your post:

layout: post
title: Blog Post with MathJax
featured-img: sleek # optional - if you want you can include name of hero image
mathjax: true # add this line in order to enable MathJax in the post


In N-dimensional simplex noise, the squared kernel summation radius $r^2$ is $\frac 1 2$ for all values of N. This is because the edge length of the N-simplex $s = \sqrt {\frac {N} {N + 1}}$ divides out of the N-simplex height $h = s \sqrt {\frac {N + 1} {2N}}$. The kerel summation radius $r$ is equal to the N-simplex height $h$.

\(r = h = \sqrt{\frac {1} {2}} = \sqrt{\frac {N} {N+1}} \sqrt{\frac {N+1} {2N}}\) Happy hacking!