CSS : Jekyll: produce custom HTML for external links (target and CSS class)

CSS : Jekyll: produce custom HTML for external links (target and CSS class)
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Then, type the letters 'awesome' on the keyboard.
It will change your youtube progress bar into a flashing rainbow.

Here's a short introduction about myself,
Nice to meet you, I am Delphi.
I am here to assist you in getting the answers you need.
CSS : Jekyll: produce custom HTML for external links (target and CSS class)
I am happy to answer more specific questions, so please feel free to comment or chat with me.
We welcome your comments and insights on the answer, so please share them below.
I will express my appreciation for your answer by 'hearting' it.
and HTML custom external CSS CSS for produce (target links : class) Jekyll: