Could one kind soul point me in the right direction in understanding the x and y of a progress bar ?

I have played around changing the values and ended up each time with a boot that "stalls" or doesn`t work..

To move this bar up, left, right or sideways. Make it longer or shorter. Make it fatter or thinner.And to reposition it elsewhere on the page.

I`ve got the hang of re-coloring it but was wondering if it can be made to flash up and down instead of left to right ?

Thank you.