css position - Overflow of sidebar with Twitter Bootstrap Affix -


i'm trying use affix plugin twitter bootstrap can't figure out how constrain within parent container, i've created following example show problem:

problem demo: http://www.codeply.com/go/dvcrxkefza

<div class="container">     <div class="row">         <div class="col-md-3 column">             <ul id="sidebar" class="well nav nav-stacked" data-spy="affix" data-offset-top="130">                 <li><a href="#software"><b>software</b></a></li>                 <li><a href="#features">features</a></li>                 <li><a href="#benefits">benefits</a></li>                 <li><a href="#costs">costs</a></li>             </ul>         </div>         <div class="col-md-9 column">             <h1>blah, blah, blah</h1>             <hr>             <a class="anchor3" id="top" name="software"></a>             <p>              content here scrolls...             </p>         </div>     </div> </div>

as can see when scroll overflows out of sidebar, doesn't affix bottom of page when reaches bottom.

from bootstrap docs (http://getbootstrap.com/2.3.2/javascript.html#affix)..

heads up! must manage position of pinned element , behavior of immediate parent. position controlled affix, affix-top, , affix-bottom. remember check potentially collapsed parent when affix kicks in it's removing content normal flow of page.

so need css affix set width element when becomes fixed. such as:

#sidebar.affix {     position: fixed;     top: 0;     width:225px;   }

demo on bootply: http://bootply.com/73864

related answers on bootstrap affix:
how create sticky left sidebar menu using bootstrap 3?
twitter-bootstrap 3 affixed sidebar overlapping content when window resized , footer


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