I had to solve the same problem today with angular ui progressbar. Other answers were close, but did not work in bootstrap 3 without changing all instances that were unacceptable to me.
This worked ... The selector gets the first child div and then applies a float
.progress-reverse div:nth-of-type(1) { float: right; }
and
<progressbar class="progress-striped progress-reverse active" value="progress" type="{{progressType}}"></progressbar>
Hope this helps!
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