Scroll progress bar for one block

Hi, I'm having a problem with uploading a progress bar to a survey. I'd like to include a progress bar that scrolls along with the text that will be given to read. It's also important for the progress bar to be visible the whole time while the readers read the text. I'm not familiar with programming, I only know I should use some sort of javascript and that my progress bar should be uploaded for one block, but I don't know how to do it :(
Can anybody help? Thanks in advance:)