Style One
1--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
2--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
3--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
4--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.

SOURCE CODE
<div class="panel-group accordion_1" id="accordion1">
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion1" href="#collapse1_1"><span class="accordion_icon"></span>title 1</a> 
        </h4>
        </div>
        <div id="collapse1_1" class="panel-collapse collapse in">
        <div class="panel-body">Content text 1 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion1" href="#collapse1_2" class="collapsed"><span class="accordion_icon"></span>title 2</a> 
        </h4>
        </div>
        <div id="collapse1_2" class="panel-collapse collapse">
        <div class="panel-body">Content text 2 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion1" href="#collapse1_3" class="collapsed"><span class="accordion_icon"></span>title 3</a>
        </h4>
        </div>
        <div id="collapse1_3" class="panel-collapse collapse">
        <div class="panel-body">Content text 3 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion1" href="#collapse1_4" class="collapsed"><span class="accordion_icon"></span>title 4</a> </h4
        >
        </div>
        <div id="collapse1_4" class="panel-collapse collapse">
        <div class="panel-body">Content text 4 ... </div>
        </div>
    </div>
</div>


Style Three
1--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
2--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
3--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
4--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.

SOURCE CODE
<div class="panel-group accordion_3" id="accordion3">
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion3" href="#collapse3_1"><span class="accordion_icon"></span>title 1</a> 
        </h4>
        </div>
        <div id="collapse3_1" class="panel-collapse collapse in">
        <div class="panel-body">Content text 1 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion3" href="#collapse3_2" class="collapsed"><span class="accordion_icon"></span>title 2</a> 
        </h4>
        </div>
        <div id="collapse3_2" class="panel-collapse collapse">
        <div class="panel-body">Content text 2 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion3" href="#collapse3_3" class="collapsed"><span class="accordion_icon"></span>title 3</a>
        </h4>
        </div>
        <div id="collapse3_3" class="panel-collapse collapse">
        <div class="panel-body">Content text 3 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion3" href="#collapse3_4" class="collapsed"><span class="accordion_icon"></span>title 4</a> </h4
        >
        </div>
        <div id="collapse3_4" class="panel-collapse collapse">
        <div class="panel-body">Content text 4 ... </div>
        </div>
    </div>
</div>


Style Two
1--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
2--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
3--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
4--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.

SOURCE CODE
<div class="panel-group accordion_2" id="accordion2">
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion2" href="#collapse2_1"><span class="accordion_icon"></span>title 1</a> 
        </h4>
        </div>
        <div id="collapse2_1" class="panel-collapse collapse in">
        <div class="panel-body">Content text 1 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion2" href="#collapse2_2" class="collapsed"><span class="accordion_icon"></span>title 2</a> 
        </h4>
        </div>
        <div id="collapse2_2" class="panel-collapse collapse">
        <div class="panel-body">Content text 2 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion2" href="#collapse2_3" class="collapsed"><span class="accordion_icon"></span>title 3</a>
        </h4>
        </div>
        <div id="collapse2_3" class="panel-collapse collapse">
        <div class="panel-body">Content text 3 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion2" href="#collapse2_4" class="collapsed"><span class="accordion_icon"></span>title 4</a> </h4
        >
        </div>
        <div id="collapse2_4" class="panel-collapse collapse">
        <div class="panel-body">Content text 4 ... </div>
        </div>
    </div>
</div>


Style Four
1--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
2--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
3--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.
4--Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam.

SOURCE CODE
<div class="panel-group accordion_4" id="accordion4">
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion4" href="#collapse4_1"><em class="glyphicons glyph-leaf"></em><span class="accordion_icon"></span>title 1</a> 
        </h4>
        </div>
        <div id="collapse4_1" class="panel-collapse collapse in">
        <div class="panel-body">Content text 1 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion4" href="#collapse4_2" class="collapsed"><em class="glyphicons glyph-cogwheel"></em><span class="accordion_icon"></span>title 2</a> 
        </h4>
        </div>
        <div id="collapse4_2" class="panel-collapse collapse">
        <div class="panel-body">Content text 2 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion4" href="#collapse4_3" class="collapsed"><em class="glyphicons glyph-power"></em><span class="accordion_icon"></span>title 3</a>
        </h4>
        </div>
        <div id="collapse4_3" class="panel-collapse collapse">
        <div class="panel-body">Content text 3 ... </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
        <h4 class="panel-title"> 
            <a data-toggle="collapse" data-parent="#accordion4" href="#collapse4_4" class="collapsed"><em class="glyphicons glyph-playlist"></em><span class="accordion_icon"></span>title 4</a> </h4
        >
        </div>
        <div id="collapse4_4" class="panel-collapse collapse">
        <div class="panel-body">Content text 4 ... </div>
        </div>
    </div>
</div>