[css] How to override Bootstrap's Panel heading background color?

You can create a custom class for your panel heading. Using this css class you can style the panel heading. I have a simple Fiddle for this.

HTML:

<div class="panel panel-default">
   <div class="panel-heading panel-heading-custom">
       <h3 class="panel-title">Panel title</h3>
   </div>
   <div class="panel-body">
       Panel content
   </div>
</div>

CSS:

.panel-default > .panel-heading-custom {
background: #ff0000; color: #fff; }

Demo Link:

http://jsfiddle.net/kiranvarthi/t1Lq966k/