What is the html class for loading progress bar?

I tried to change the style for the progress bar during loading, but it was too quick to open the dev tools. I was wondering

  1. What is the class(or other ways to style) for this element? Does it change in the mobile app?
  2. How to find out these elements’ classes in general, when they disappear quickly?

Thank you

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While I still haven’t found a way to pause/add a breakpoint during the loading, it seems the progress bar color can be changed with:

.progress-bar-line {
    background-color: #F00 !important;
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