The accordion used in this code has a red background. The accordion itself is also bright red. The title of each accordion is white and there is an icon to the left of the icon. On the right side of the title there is an icon that if the accordion is open and its text is displayed, this icon is closed and if the accordion is closed, the icon is plus.


HTML
<!-- This script got from www.devanswer.com -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<h1>Pure HTML+CSS Accordion (Without Javascript)</h1>
<div class="acc-kontainer">          
    <div>
        <input type="radio" name="acc" id="acc1" checked>
        <label for="acc1"><i class="fa fa-map-marker"></i> My name?</label>
        <div class="acc-body">
            Hi, You can call me Dandi.
        </div>
    </div>
    <div>
        <input type="radio" name="acc" id="acc2">
        <label for="acc2"><i class="fa fa-heart"></i> What am I interesting for?</label>
        <div class="acc-body">
            All the thing about Technology! Informatic technology especially.
        </div>
    </div>
    <div>
        <input type="radio" name="acc" id="acc3">
        <label for="acc3"><i class="fa fa-music"></i> What is my hobby?</label>
        <div class="acc-body">
            i love music <i class="fa fa-headphones"></i>, watching movie <i class="fa fa-film"></i>, Designing maybe <i class="fa fa-code"></i>
        </div>
    </div>
</div><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com">Developers Answer</a></div>
                        

CSS
body {
  background-color:#c15236;
   font-family:'Arial';
   padding:2em 6em;
 }
 h1{
   color:#fff;
   text-align:center;
 }
 .acc-kontainer {
   width: 100%;
   margin: auto;
 }
 .acc-kontainer .acc-body {
   width: 98%;
   width: calc(100% - 20px);
   margin: 0 auto;
   height: 0;
   color: rgba(0, 0, 0, 0);;
   background-color: rgba(255, 255, 255, 0.2);
   line-height: 28px;
   padding: 0 20px;
   box-sizing: border-box;
   transition: 0.5s;
 }
 .acc-kontainer label {
   cursor: pointer;
   background-color: rgba(255, 255, 255, 0.1);
   border-bottom: 1px solid rgba(255, 255, 255, 0.1);
   display: block;
   padding: 15px;
   width: 100%;
   color: #fff;
   font-weight: 400;
   box-sizing: border-box;
   z-index: 100;
 }
 .acc-kontainer input{
   display: none;
 }
 .acc-kontainer label:before {
   font-family: 'FontAwesome';
   content: '\f067';
   font-weight: bolder;
   float: right;
 }
 .acc-kontainer input:checked+label {
   background-color: rgba(255, 255, 255, 0.15);
 }
 .acc-kontainer input:checked+label:before {
   font-family: 'FontAwesome';
   content: '\f00d';
   transition: 0.5s;
 }
 .acc-kontainer input:checked~.acc-body {
   height: auto;
   color: #fff;
   font-size: 16px;
   padding: 20px;
   transition: 0.5s;
 }