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HTML 

              
                <body>
  <div class="header">
    <h1>3D Rotation</h1>
    <p>Click the card to see rotation</p>
  </div>
  <div class="cards-wrapper">
    <div class="card-container">
      <div class="card">
        <div class="card-contents card-front">
          <div class="card-depth">
            <h2>Click card</h2>
            <hr>
            <p>For 3D rotation</p>
          </div>
        </div>
        <div class="card-contents card-back">
          <div class="card-depth">
            <h2>Click card again</h2>
            <hr>
            <p>To turn back</p>
          </div>
        </div>
      </div>
    </div>
  </div>
</body>
!

CSS 

              
                /**
* Important properties to make this animation work:

* backface-visibility: hidden;
  * Hide the back of the card until it should be visible
  * https://developer.mozilla.org/en-US/docs/Web/CSS/backface-visibility

* transform-style: preserve-3d;
  * Makes children elements positioned in 3D space. Default is flat.
  * https://developer.mozilla.org/en-US/docs/Web/CSS/transform-style

* transform: translateZ(100px);
  * Moves elements closer to or further away from the the viewer
  * https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/translateZ

* perspective: 1200px;
  * Setting the distance between the element and the user
    to determine perspective of 3D elements
  * Lowering this value will make the animation more "in your face"
  * https://developer.mozilla.org/en-US/docs/Web/CSS/perspective

*/


body {
  background: linear-gradient(to right, #141e30, #243b55);
}

h1, h2, h3, h4, p {
  color: #FFFFFF;
  font-family: Arial, sans-serif;
}

// HEADER
.header {
  text-align: center;
  span {
    padding-right: 5px;
  }
}

// CARD
.cards-wrapper {
  margin-top: 50px;
}
.card-container {
  perspective: 1200px;
}
.card {
  margin: 0 auto;
  height: 500px;
  width: 500px;
  max-width: 80%;
  position: relative;
  border-radius: 25px;
  transition: all 1s ease;
  transform-style: preserve-3d;
  box-shadow: 1px 3px 3px rgba(0,0,0,0.2)
}

.rotated {
  transform: rotateY(-180deg);
}
.card-contents {
  width: 100%;
  height: 100%;
  border-radius: 25px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  text-align: center;
  position: absolute;
  top: 0;
  left: 0;
  backface-visibility: hidden;
  h2, p {
    text-shadow: 1px 2px 2px rgba(0,0,0,0.2);
  }
  h2 {
    font-size: 3em;
    margin: 0 auto;
  }
  hr {
    width: 50%;
    margin: 20px auto;
  }
  p {
    margin: 0 auto;
  }
}
.card-depth {
   transform: translateZ(100px) scale(0.98);
   perspective: inherit;

}
.card-front {
  background: linear-gradient(to top left, #3a6186, #89253e);           
  transform-style: preserve-3d;
}
.card-back {
  transform: rotateY(180deg);
  background: linear-gradient(to top left, #ffa17f, #00223e);
  transform-style: preserve-3d;
}
!

JS 

              
                const card = document.querySelector('.card');

function clickRotate() {
  card.classList.toggle('rotated');
}
card.addEventListener('click', clickRotate);


// Uncomment the rest of the JS to enable click and drag to rotate.
// It is pretty buggy so I left it disabled to leave focus on the 3D CSS animation.

/*

// isDown is a flag to check if the mouse is down whe running a function
// startX will represent where the mouse was on the card when the drag started
let isDown = false; 
let startX;

// set isDown to true, set value of for where the mouse started
function startRotation(e) {
  isDown = true;
  startX = e.pageX - this.offsetLeft;
}

// function to stop the rotation
function stopRotation(e) {
  isDown = false;
}

function dragRotate(e) {
  if(!isDown) return; // if mouse is not down, exit function 
  e.preventDefault();
  
  // get value for how much the mouse has moved 
  // dividing by two here just to slow it down a bit
  const movement = (e.pageX - this.offsetLeft - startX) / 2;
  
  // set rotation value using template literal
  this.style.transform = `rotateY(${movement}deg)`;
}

// event listeners 
card.addEventListener('click', clickRotate);
card.addEventListener('mousedown', startRotation);
card.addEventListener('mouseleave', stopRotation);
card.addEventListener('mouseup', stopRotation);
card.addEventListener('mousemove', dragRotate);

*/
!
999px

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