How to add span top right corner of the pre tag?

Question

This my code↓
https://code.sololearn.com/WOqbLmVVi2Ff/?ref=app

Answer 1

a[i].parentNode.insertBefore(obj,a[i]);

And remove the tags <br>
And I would remove the strip from the right

Answer 2

float: right;

Answer 3

Vasiliy Thank you.

Answer 4

Vasiliy
I want to set that on top right corner.