Adding Superscript with Links

Site URL: https://anaritamorais.com/

Hi!

I'd like to add linked superscripts to my website a la this site https://anaritamorais.com/ I've read about adding text boxes with superscript but unsure if that's how it would be done. Any help would be much appreciated. 

Thank you!

Juliet 

You mean this text effect? https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_sup

Which text you want to apply on your site?

I think this might work @tuanphan but what I want to do is add numbers to the body of my site and then have them show an image or hyperlink. For example, on the site example I provided, her "1" shows a picture of the woman. So i want to do something like that. 

It does work! But what I want to do is have an image appear upon hovering over the superscript I've put in. Any help would be much appreciated.