如何更改活动时的折叠颜色？

Question

I would like to change collapse heading color (background and font color):

http://jsfiddle.net/KbQyx/

How to make this thing ?

<div class="panel-group" id="accordion">
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title">
        <a  data-toggle="collapse" data-parent="#accordion" data-target="#collapseOne">
          Collapsible Group Item #1
        </a>
      </h4>
    </div>
    <div id="collapseOne" class="panel-collapse collapse in">
      <div class="panel-body">
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      </div>
    </div>
  </div>

</div>

Answer 1

I am assuming that data-accordion is only in <h4> tag.

Here is a working solution: jsfiddle

.panel-default > .panel-heading > .panel-title.collapsed > a{
    color: #333;
    background-color: #f5f5f5;
    border-color: #ddd;
  }


 .panel-default > .panel-heading > .panel-title:not(.collapsed) > a{
    color: #fff;
    background-color: red;
    border-color: red;
   }