How to use CSS in Markdown?

Question

I want to use a CSS class in a Markdown file.

For instance, (from fontawesome) should be displayed as

Answer 1

The simplest way to add custom css styles is to use Pandoc attributes syntax (which can convert Markdown to html, pdf, pppt and more)

Heading Identifiers:
### Red text title {#identifier .red}

Fenced Code Attributes:
{.red .numberLines startFrom="1"}

Inline Code Attributes:
`red text`{.red}

Bracketed Spans:
[This is *some red text*]{.red}

Link Attributes:
![alt text](the.jpg){.center}