The purpose of progress bars is to show that assets are loading, in progress, or that there is action taking place regarding elements on the page.
To create a default progress bar, add a .progress class to a <div> element
To create colored progress bar you can use contextual classes. The contextual classes that can be used with progress bars are
Add class .progress-bar-striped to add stripes to the progress bars
Add class .active to animate the progress bar
Create a stacked progress bar by placing multiple bars into the same <div class="progress">
