<ul class="main-box">
    <li class="box active"><span>Slide One</span>

        <div class="detail active">
			<p>  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
			<p>
			
		   
		   The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested.
			</p>
        </div>
    </li>
    <li class="box"><span>Slide Two</span>
        <div class="detail">
          <p>  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
			<p>
			
		   
		   The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested.
			</p>
        </div>
    </li>
    <li class="box"><span>Slide Three</span>

        <div class="detail">
              <p>  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
			<p>
			
		   
		   The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested.
			</p>
        </div>
    </li>
    <li class="box"><span>Slide Four</span>
    <div class="detail">
          <p>  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
			<p>
			
		   
		   The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested.
			</p>
    </div>
</li>

    <li class="box"><span>Slide Five</span>
        <div class="detail">
           <p>  Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
			<p>
			
		   
		   The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested.
			</p>
        </div>
    </li>
</ul>

@import url('https://fonts.googleapis.com/css?family=Montserrat:400,700&display=swap');


body 
{
	font-family: 'Montserrat', sans-serif;
	background: #f1f1f1;
}

.main-box
{
    display: flex;
    background: #000;
    margin: 70px auto 70px auto;
    padding:0;
    width: 991px;
}

.box
{

height: 322px;
padding:15px;
border-right: 1px solid white;
webkit-transition: 0.8s;
-o-transition: 0.8s;
transition: 0.8s;
position: relative;
overflow: hidden;
list-style: none;
}

.detail
{
    width: 85%;
    height: 100%;
    position: absolute;
    right: 0;
    top:0;
    background: white;
    color:black;
    opacity: 0;
    padding:30px;
    box-sizing:border-box;
    webkit-transition: 0.8s;
    -o-transition: 0.8s;
    transition: 0.8s;
    -webkit-transform: translateY(100%);
    transform: translateY(100%);
}

.box.active
{
    width: 70% !important;
}

.box.active .detail
{
    opacity: 1;
    -webkit-transition-delay: 0.6s;
    -moz-transition-delay: 0.6s;
    -o-transition-delay: 0.6s;
    transition-delay: 0.6s;
    transform: none;
}

.box span {
    writing-mode: vertical-rl;
    font-size: 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 4px;
    width: 40px;
    transform: rotate(180deg);
    font-weight: 400;
    cursor: pointer;
    position: absolute;
    left: 0;
    right: 0;
    margin: 0 auto;
  
}

.box.active span 
{
	left:25px;
	right:auto;
	margin:0;
  font-weight:600
}

p 
{
	line-height: 23px;
}

  var getslide = $('.main-box li').length - 1;

    var slidecal = 30/getslide+'%';

    $('.box').css({"width": slidecal});

    $('.box').click(function(){
        $('.box').removeClass('active');
       $(this).addClass('active');
    });