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What do I have to change in your script in order to move the subtitle preview label from the top left corner to the middle center?
Modify left and top css on lines 51/52, and change them to 50%, like this:
new_element.style.left = "50%";
new_element.style.top = "50%";
Then, insert a new line on line 58, and add this:
new_element.style.margin = "-9.5px 0 0 -8px";
After that, it should look like this.
Thank you very much!