JSFiddle - React, Tailwind, and code Playground

HTML

<section class="mbox mbox_closed" id="effect1_1">
	     <h2>BUSINESS PC</h2>
	
	    <div class="mbox_content" id="effect2_1">
	         <h3>Lorem ipsum dolor sit amet, consetetur sadipscing elitr! 
	            <span>sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam</span>
	        </h3>
	
	        <p>Erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
	    </div>
	    <hr>
	    <img src="http://www.club-3d.com/tl_files/club3d/uploads/en/content/Accesories/CAC-1052/cac-1052_use_01.png" alt="Testbild">
	    <!--<div class="mbox_bar"></div>-->
	</section>

CSS

@import url(http://fonts.googleapis.com/css?family=Open+Sans);
 body, html {
    height:100%;
    padding:0;
    margin:0;
    background:#5cafff;
    font-family:'Open Sans', sans-serif;
}
.mbox {
    z-index: 1;
    margin: 2em;
    position:relative;
    background: #ff1a00;
    background: linear-gradient(to right, #ffffff 33%, #ff1a00 100%);
    border: 1px solid #fff;
    height:200px;
    clear:both;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=90)";
	filter: alpha(opacity=90);
	-moz-opacity: 0.9;
	-khtml-opacity: 0.9;
	opacity: 0.9;
}
.mbox_closed:hover {
	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
	filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
	opacity: 1.0;
	-moz-box-shadow:  0px 0px 12px 8px rgb(128,128,128);
	-webkit-box-shadow:  0px 0px 12px 8px rgb(128,128,128);
	box-shadow:  0px 0px 12px 8px rgb(128,128,128);
}
.mbox_active {
	z-index: 1;
    margin: 2em;
    position:relative;
    background: #ff1a00;
    background: linear-gradient(to right, #ffffff 33%, #ff1a00 100%);
    border: 1px solid #fff;
    height:200px;
    clear:both;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
	filter: alpha(opacity=100);
	-moz-opacity: 1.0;
	-khtml-opacity: 1.0;
	opacity: 1.0;
}
.mbox * {
    padding:0;
    margin:0;
}
.mbox_content {
    z-index: 2;
    float:left;
    padding: 20px;
    background: #ffffff;
    width:60%;
    height:160px;
    overflow: hidden;
    overflow-y: hidden;
}
.mbox img {
    z-index:-1;
    position:absolute;
    right:0;
    max-height:100%;
}
.mbox hr {
    z-index: 2;
    float:left;
    width: 0;
    height: 0;
    border-style: solid;
    margin-top: 30px;
    border-width: 15px 0 15px 20px;
    border-color: transparent transparent transparent #ffffff;
}
.mbox_bar {
	z-index: 2;
    float:right;
    width: 30;
    height: 100%;
    border-style: solid;
    border-width: 0 10px 3px 3px;
    border-color: #ffffff #ffffff #ffffff...

JavaScript

var state = []

$(function() {

        state[1] = true;

        $( "#effect1_1" ).click(function() {

            if ( state[1] ) {
                $( "#effect1_1" ).animate({
                    height: $( "#effect2_1" ).prop( "scrollHeight" )
                }, 1000 );
                $( "#effect2_1" ).animate({ // since scrollHeight brings the padding too, we need to remove it so the div not 'pops out' the container
                    height: $( "#effect2_1" ).prop( "scrollHeight" ) - parseInt( $( "#effect2_1" ).css( "padding-top" ), 10 ) - parseInt( $( "#effect2_1" ).css( "padding-bottom" ), 10 )
                }, 1000 );

                $( "#effect1_1" ).removeClass( "mbox_closed" ).addClass( "mbox_active" );

            } else {
                $( "#effect1_1" ).animate({
                    height: 200
                }, 1000 );
                $( "#effect2_1" ).animate({
                    height: 160
                }, 1000 );

                $( "#effect1_1" ).removeClass( "mbox_active" ).addClass( "mbox_closed" );

            }
        state[1] = !state[1];
        });
});