Hi there! It is for me to thank you for the visit to my post, the engagement and the kind words.
Unfortunately Steemit only allows for black and red writing. What you are seeing are images. I copied them, paste them on a Word document, changed the color, and then I use "snipping tool", snip the image and then I paste it in my post.
If you take the link of a Steemit post and you make the "it" a "d" you will see how the post was posted. In other words, the markdown style that was used.

Good luck!