How to increase the width of the horizontal line using markdown git hub

From the cheatsheet

Three or more...

Hyphens

---

---

Asterisks

***

---

Underscores

___

---

give you the same thing, which is the standard horizontal line.

You cannot style markdown, you get what you get. Github chooses the style.

instead of using *** or --- , try

<hr style="border:2px solid gray"> </hr>

You can add a thinner line than the normal one by simply writing an empty heading #

Example: