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HTML

            
              <section class="controls">
  <button id="open-button">Open</button>
</section>


<section id="modal-1" class="modal-container">
  
  <div class="modal-dialog">    
    <svg class="modal-svg" viewBox="0 0 100 100" preserveAspectRatio="none">
      <polygon class="modal-polygon" />
    </svg>
    
    <div class="modal-content">
      <h2>I'm a modal</h2>
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Omnis excepturi ut inventore consectetur quos rerum quibusdam accusamus, labore itaque assumenda consequatur cum saepe velit quidem ipsa facilis. Repellendus, reiciendis quam?</p>
    </div>
    
  </div>
</section>
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CSS

            
              button {
  cursor: pointer;
  padding: 0 6px;
  min-width: 88px;
  min-height: 36px;
}

.controls {
  padding: 24px;
}

.modal-container {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: rgba(0,0,0,0.15);  
  opacity: 0;
  visibility: hidden;
}

.modal-dialog {
  width: 70vmin;
  height: 70vmin;  
  position: relative;
  overflow: hidden;
}

.modal-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.modal-polygon {
  fill: #ab47bc;
}

.modal-content {
  position: relative;
  top: 0;
  left: 0;
  padding: 24px;  
  visibility: hidden;
  opacity: 0;  
  color: rgba(255,255,255,0.87);
}
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JS

            
              console.clear();

var body = document.body;
var modal = createModal(document.querySelector("#modal-1"));
var openButton = document.querySelector("#open-button");

openButton.addEventListener("click", function() {
  modal.open();
});

function createModal(container) {
  
  var content = container.querySelector(".modal-content");
  var dialog = container.querySelector(".modal-dialog");
  var polygon = container.querySelector(".modal-polygon");
  var svg = container.querySelector(".modal-svg");
  
  var point1 = createPoint(45, 45);
  var point2 = createPoint(55, 45);
  var point3 = createPoint(55, 55);
  var point4 = createPoint(45, 55);
      
  var animation = new TimelineMax({    
      onReverseComplete: onReverseComplete,
      onStart: onStart,
      paused: true
    })     
    .to(point1, 0.3, {
      x: 15,
      y: 30,
      ease: Power4.easeIn
    }, 0)
    .to(point4, 0.3, {
      x: 5,
      y: 80,
      ease: Power2.easeIn
    }, "-=0.1")
    .to(point1, 0.3, {
      x: 0,
      y: 0,
      ease: Power3.easeIn
    })
    .to(point2, 0.3, {
      x: 100,
      y: 0,
      ease: Power2.easeIn
    }, "-=0.2")
    .to(point3, 0.3, {
      x: 100,
      y: 100,
      ease: Power2.easeIn
    })
    .to(point4, 0.3, {
      x: 0,
      y: 100,
      ease: Power2.easeIn
    }, "-=0.1")  
    .to(container, 1, {
      autoAlpha: 1
    }, 0)  
    .to(content, 1, {
      autoAlpha: 1
    })
  
  var modal = {
    animation: animation,
    container: container,
    content: content,
    dialog: dialog,    
    isOpen: false,
    open: open,
    close: close   
  };
  
  body.removeChild(container);
    
  function onClick() {
    
    if (modal.isOpen) {
      close();
    }
  }
  
  function onStart() {
    body.appendChild(container);
    container.addEventListener("click", onClick);
  }
  
  function onReverseComplete() {
    container.removeEventListener("click", onClick);
    body.removeChild(container);
  }
  
  function open() {
    modal.isOpen = true;
    animation.play().timeScale(2);
  }
  
  function close() {
    modal.isOpen = false;
    animation.reverse().timeScale(2.5);
  }
    
  function createPoint(x, y) {
    var point = polygon.points.appendItem(svg.createSVGPoint());
    point.x = x || 0;
    point.y = y || 0;
    return point;
  }
  
  return modal;
}
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