This is plugin of Pelican. You can replace a text of a generated HTML. You can write replacing rule in your pelicanconf.py.
This example is replacing from '<table border="1" class="docutils">' to '<table class="table table-striped table-bordered table-hover">'.
REPLACES = ( (u'<table border="1" class="docutils">', u'<table class="table table-striped table-bordered table-hover">'), )