I was going through a Bootstrap tutorial when I encountered myself with a problem. It may be silly but I can't work it out. I have an article and a side bar in a row class with 9 and 3 columns each. The background color of the article (blue) finishes just below the text, and I want it to fit the height of the side bar. In the tutorial that doesn't happen but at any point he explains why. So I'd be glad if you could help me.
<section class="main row">
<article class="color1 col-xs-12 col-sm-8 col-md-9">
<h3>Article</h3>
<p>
Manual positioning of feedback icons is required for inputs without a label and for input groups with an add-on on the right. You are strongly encouraged to provide labels for all inputs for accessibility reasons. If you wish to prevent labels from being displayed, hide them with the .sr-only class. If you must do without labels, adjust the top value of the feedback icon. For input groups, adjust the right value to an appropriate pixel value depending on the width of your addon.
</p>
</article>
<aside class="color2 col-xs-12 col-sm-4 col-md-3">
<h3>Sidebar</h3>
<p>
Manual positioning of feedback icons is required for inputs without a label and for input groups with an add-on on the right. You are strongly encouraged to provide labels for all inputs for accessibility reasons. If you wish to prevent labels from being displayed, hide them with the .sr-only class. If you must do without labels, adjust the top value of the feedback icon. For input groups, adjust the right value to an appropriate pixel value depending on the width of your addon.
</p>
</aside>
</section>
All that code is inside a container class. My .color1 and .color2 classes define just the background-color.
Attached an image to help figure my idea out. Image with indication