gistfile1.txt

# html

<div class="user">
  <img src="/avatar.gif" />
  <h4>Jimbo Jones</h4>
</div>

# css

div.user {
  include bootsrap.well
}
div.user img {
  include bootstrap.img-circle
}

# instead of mixing up all sorts of css stuff in the html

<div class="user well">
  <img src="/avatar.gif" class="img-circle">
  <h4>Jimbo Jones</h4>
</div>