what is @tailwind in css code example

Example 1: tailwind css

<link href="https://unpkg.com/tailwindcss@^2.0/dist/tailwind.min.css" rel="stylesheet">

Example 2: tailwind css

Tailwind is designed to be component friendly. It is so much easier 
to separate a site's elements into smaller components and not pollute 
the codebase with objects or extraneous CSS classes. Furthermore, 
every class is inlined in the component, making it much easier to read and 
understand.