I don't understand why row class has margin-left: -20px
(so it grows after parents border like on the image). I think nobody needs this behavior. Or am I doing something wrong?
<div class="container">
<div id="top-container" class="row">
<div class="span8">
<h1>App</h1>
</div>
<div class="span4">
</div>
</div>
</div>