I am having difficulties of this code. I know this is too easy for you. I have accordion collapse changing background color when clicked(collapsed). the transition of none background color into background color is successfully working fine. the only problem is, I like to deactivate the background color on the first load. here is the code http://jsfiddle.net/gjLxo7be/

.med-header a:not(.collapsed) {
    background-color: #1b3189;
}

a:not(.collapsed) p.contitle1 {
    color: #fff;
}

p.contitle1 {
  color: #1b3189;
  font-size: 25px;
  letter-spacing: 1px;
  margin: 0 15px;
    text-align: justify;
    font-weight: 500;
  }
  
 .med-header a {
    display: block;
    position: relative;
  }

<div id="accordion" role="tablist">
<div class="card m-1 ">
<!--1st-->                              
<div class="panel-default-med">
<div class="med-header" role="tab">
<a data-toggle="collapse" class="text-decoration-none" href="#section-1">
<div class="med-wrap">
 <p class="contitle1">診療方針について</p>
</div>
</a>
</div>
<div class="collapse" id="section-1" data-parent="#accordion">
<div class="card-body">
<p class="context-med">
糖尿病や高血圧等のいわゆる生活習慣病の予防および治療、その合併症である循環器、腎臓疾患等を診療します。 またプライマリ・ケア医として一般内科の他、風邪、呼吸器疾患、骨粗鬆症等の診断や治療も行います。一方で、高齢化に伴って急増している認知症につきましても、もの忘れ外来を開設して診療を行います。                                           
</p>
</div>
</div>
</div>
</div> 
</div>

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

or maybe closed the collapse accordion when clicked outside by using javascript? any codes will do. 

CodePudding user response：

You won't believe me, but just do this, add "collapsed" class to the "anchor" tag like this,

<a data-toggle="collapse" class="text-decoration-none collapsed" href="#section-1">

You are good to go.