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HTML

CSS

CSS Base

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JavaScript

Babel includes JSX processing.

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HTML

              
                <div id="container">
  <div id="n1" class="appearing"></div>
  <div id="n2" class="disappearing">
   <div id="text">
     <div id="text-box">
     Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris cursus vestibulum neque, et scelerisque sem venenatis ac. Duis feugiat orci non consequat pulvinar. Sed felis neque, egestas at elit at, pretium mollis massa. Mauris id nunc id leo convallis auctor a nec urna. Nulla nec risus non sem laoreet sollicitudin faucibus ut augue. Aliquam consequat mattis interdum. Pellentesque eget tincidunt risus. Vivamus vel aliquet nisi, at venenatis tellus. Quisque felis orci, suscipit ac suscipit a, eleifend ac orci. Aenean tempus, dolor nec ultricies tincidunt, ex quam porta lorem, ac suscipit diam augue a urna. Donec ac enim non tortor hendrerit efficitur.
     </div>
   </div>
  </div>
</div>
              
            
!

CSS

              
                body {
  overflow: hidden;
}
#container {
  font-family: Quicksand;
  font-weight: 500;
  font-size: 18px;
  color: white;
  margin-top: 70px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);

   height: 20em;
   width: 30em;
  display: flex;
  
}

#n1 {
  height: 20em;
  background-color: #7392c4;
  transition: width 1s;
} 

#n2 {
  height: 20em;
  background-color: #e06d99;
  transition: width 1s;
}

#text {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 20em;
  width: 30em;
  transition: opacity 1s;
}

#text-box {
  height: 18em;
  width: 28em;
  
}

.appearing {
  width: 100%;
}

.disappearing {
  width: 0%;
}
.disappearing #text {
  opacity: 0;
}

body {
  display: flex;
  alignt-items: center;
  justify-content: center;
}
              
            
!

JS

              
                var container = document.getElementById("container");

let n1 = document.getElementById("n1");
let n2 = document.getElementById("n2");

n1Classes = n1.classList
n2Classes = n2.classList

container.addEventListener("click", (e) => {
  container.getBoundingClientRect()
  
  var x = e.pageX - container.getBoundingClientRect().x
  
  var y = e.pageY - container.getBoundingClientRect().y
  console.log(x,y)
  if(n1.classList.contains("appearing")) {
    n1.classList.remove("appearing")
    n1.classList.add("disappearing")
    n2.classList.remove("disappearing");
    n2.classList.add("appearing")
  }
  else if(n2.classList.contains("appearing")) {
    n2.classList.remove("appearing")
    n2.classList.add("disappearing")
    n1.classList.remove("disappearing")
    n1.classList.add("appearing")
  }
})

 
              
            
!
999px

Console