Let's copy the minima theme default layout template locally so we can modify it.

mkdir _includes
cp $(bundle show minima)/_includes/head.html _includes

Include the the following line taken from the getting started section of Tachyons into the head.html file, before the links to the other stylesheets.

<link rel="stylesheet" href="https://unpkg.com/tachyons@4.7.0/css/tachyons.min.css"/>

We are now ready to try out Tachyons. Let's copy an example from the GRIDS section in the tachyons style guide:

<div class="fl w-75 pa2">
  <div class="outline bg-white tc pv4">
    <code>fl w-75</code>
  </div>
</div>
<div class="fl w-25 pa2">
  <div class="outline bg-white tc pv4 truncate no-wrap">
    <code>fl w-25</code>
  </div>
</div>

this produces:

Let's look up what all these classnames mean on tachyons tldr.

As we can see, the no-wrap class in one of the div tags is in fact superfluous, since it is subsumed by the truncate class.

The kramdown engine used by jekyll allows for inline attributes, with an easy shortcut for classnames and re-use through attribute list definitions:

> A padded outlined blockquote
{: .pa4 .outline}

{::comment}The following line defines a reusable ALD{:/comment}
{:my-paragraph: .fl .w-50 .outline .pv1 .ph4}

This custom paragraph is red
{:my-paragraph .bg-red}

And this one is blue
{:my-paragraph .bg-blue}

A padded outlined blockquote

This custom paragraph is red

And this one is blue

Styling inline HTML may be all fun and games; styling markdown directly looks slightly more useful, but if we're actually trying to use Tachyons as much as possible, we need to look at the layout templates. A good starting point looks like trying to reproduce minima's layout using Tachyons, before trying to actually customize it.

Let's start by looking at minima's sass:

...

// Import partials.
@import
  "minima/base",
  "minima/layout",
  "minima/syntax-highlighting"
;

This gives us a hint at where the layout styles are defined. Let's pick out the first one (.site-header) and replace it. Let's find where it is used using the_silver_searcher:

ag site-header $(bundle show minima)

The file in question is _includes/header.html. So let's copy it locally so we can edit it.

mkdir _includes
cp $(bundle show minima)/_includes/header.html _includes

We now need to replace the class site-header with Tachyons classes such that the resulting styles more or less resemble:

.site-header {
  border-top: 5px solid #424242;
  border-bottom: 1px solid #e8e8e8;
  min-height: 55.95px
  position: relative;
}

Again, let's use tachyons tldr, to find the right classes. This time searching by CSS property names helps to get started, but after figuring out the structure of Tachyon's classname acronyms, we can quickly switch back to search by class name. w3schools CSS Reference is also very useful here.

The closest we can get to it is bt bb b--gray h4 relative, since we are missing definitions for border-top widths other than 1px, and for border-bottom-color and border-top-color.

To define our own classes, we first need to copy the assets/main.scss file from minima.

mkdir assets
cp $(bundle show minima)/assets/main.scss assets

Now we can modify this file to include the following classes:

.bb--light-gray {
  border-bottom-color: #eee;
}

.bt--dark-gray {
  border-top-color: #333;
}

.bt1 {
  border-top-width: .25rem;
}

and all that's left to do now is to include these classes in the header tag:

<header class="bt bt1 bt--dark-gray bb bb--light-gray h3 relative" role="banner">
  ...
</header>

The remainder of the layout classes can be "removed" in a similar fashion gradually.