How to underline on my hyperlink like this one?

Hi there,

Can you link me to the live example where the screenshot was taken from?

Then I can give you the exact same code including colors and everything.

Let me know :)

Check it: https://dayjobproblem.com/blogging/how-i-made-1274-in-my-third-month-of-blogging

Try this:

.entry-content a {
    border-bottom: 1px solid #ff6857;
}

Adding CSS: https://docs.generatepress.com/article/adding-css/

It's amazing, thanks...

No problem :)