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HTML

              
                <div class="modal micromodal-slide" id="modal-1" aria-hidden="true">
  <div class="modal__overlay" tabindex="-1" data-micromodal-close>
    <div class="modal__container" role="dialog" aria-modal="true" aria-labelledby="modal-1-title">
      <header class="modal__header">
        <h2 class="modal__title">
          Micromodal
        </h2>
        <button class="modal__close" aria-label="Close modal" data-micromodal-close></button>
      </header>
      <div class="modal-content-content">
        <div class="modal__content">
          Modal content
        </div>
        <footer class="modal__footer">
          <button class="modal__btn" data-micromodal-close aria-label="Close this dialog window">Close</button>
        </footer>
      </div>
    </div>
  </div>
</div>

<a data-micromodal-trigger="modal-1" href='javascript:void(0);'>Open Modal Dialog</a>
              
            
!

CSS

              
                
/**************************
  Basic Modal Styles
**************************/

.modal {
  font-family: -apple-system,BlinkMacSystemFont,avenir next,avenir,helvetica neue,helvetica,ubuntu,roboto,noto,segoe ui,arial,sans-serif;
}

.modal__overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index:10;
}

.modal__container {
  background-color: #fff;
  padding: 30px;
  max-width: 740px;
  height: 100%;
  width: 50%;
  border-radius: 4px;
  overflow-y: auto;
  box-sizing: border-box;
}

@supports (display: flex) {
	
	.modal__container {
		height: initial;
		max-height: 80vh;
	}
	
}

.modal__header {
  position: relative;
  display: block;
  height: 30px;
  margin-bottom: 20px;
}

@supports (display: flex) {
	
	.modal__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
	  height:initial;
	  margin-bottom: 0px;
	}
	
}

.modal__title {
  position: absolute;
  top: 20px;
  left: 20px;
  margin-top: 0;
  margin-bottom: 0;
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.25;
  color: #00449e;
  box-sizing: border-box;
}

.modal__close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: 0;
  cursor: pointer;
  margin: 0px;
  padding: 0px;
}

@supports (display: flex) {
	
  .modal__title {
	  position: static;
  }
	
  .modal__close {
	  position: static;
  }
  
}

.modal__header .modal__close:before { content: "\2715"; }

.modal__content {
  margin-top: 10px;
  margin-bottom: 10px;
  color: rgba(0,0,0,.8);
}

@supports (display: flex) {
	
	.modal__content {
	  margin-top: 2rem;
	  margin-bottom: 2rem;
	  line-height: 1.5;
	}

}

.modal__btn {
  font-size: .875rem;
  padding-left: 1rem;
  padding-right: 1rem;
  padding-top: .5rem;
  padding-bottom: .5rem;
  background-color: #e6e6e6;
  color: rgba(0,0,0,.8);
  border-radius: .25rem;
  border-style: none;
  border-width: 0;
  cursor: pointer;
  -webkit-appearance: button;
  text-transform: none;
  overflow: visible;
  line-height: 1.15;
  margin: 0;
  will-change: transform;
  -moz-osx-font-smoothing: grayscale;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  transition: -webkit-transform .25s ease-out;
  transition: transform .25s ease-out;
  transition: transform .25s ease-out,-webkit-transform .25s ease-out;
}

.modal__btn-primary {
  background-color: #00449e;
  color: #fff;
}

/**************************
  Demo Animation Style
**************************/

@keyframes mmfadeIn {
    from { opacity: 0; }
      to { opacity: 1; }
}

@keyframes mmfadeOut {
    from { opacity: 1; }
      to { opacity: 0; }
}

@keyframes mmslideIn {
  from { transform: translateY(15%); }
    to { transform: translateY(0); }
}

@keyframes mmslideOut {
    from { transform: translateY(0); }
    to { transform: translateY(-10%); }
}

.micromodal-slide {
  display: none;
}

.micromodal-slide.is-open {
  display: block;
}

.micromodal-slide[aria-hidden="false"] .modal__overlay {
  animation: mmfadeIn .3s cubic-bezier(0.0, 0.0, 0.2, 1);
}

.micromodal-slide[aria-hidden="false"] .modal__container {
  animation: mmslideIn .3s cubic-bezier(0, 0, .2, 1);
}

.micromodal-slide[aria-hidden="true"] .modal__overlay {
  animation: mmfadeOut .3s cubic-bezier(0.0, 0.0, 0.2, 1);
}

.micromodal-slide[aria-hidden="true"] .modal__container {
  animation: mmslideOut .3s cubic-bezier(0, 0, .2, 1);
}

.micromodal-slide .modal__container,
.micromodal-slide .modal__overlay {
  will-change: transform;
}

/**************************
  Custom styles for individual modals
**************************/

.modal__container button {
	outline: none;
	cursor: pointer !important;
}

.modal__container h2.modal__title {
	color: #595959;
}

.modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal__title {
  margin-top: 0;
  margin-bottom: 0;
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.25;
  color: #00449e;
  box-sizing: border-box;
}

.modal__close {
  font-size: 24px;
}

.modal__content {
  margin-top: 2rem;
  margin-bottom: 2rem;
  line-height: 1.5;
  color: rgba(0,0,0,.8);
}

.modal__btn {
  padding: 10px 15px;
  background-color: #e6e6e6;
  border-radius: 4px;
  -webkit-appearance: none;
}

/**************************
  Mobile custom styles for individual modals
**************************/

@media only screen and (min-device-width : 320px) and (max-device-width : 480px) {
	
	.modal__container {
	  width: 90% !important;
	  min-width: 90% !important;
	}
	
	@supports (display: flex) {
	
		.modal__container {
			width: 90% !important;
			min-width: 90% !important;
		}
		
	}
  
}
              
            
!

JS

              
                document.addEventListener("DOMContentLoaded", function() {
  
  try {
    
    MicroModal.init({
      awaitCloseAnimation: true,// set to false, to remove close animation
      onShow: function(modal) {
        console.log("micromodal open");
      },
      onClose: function(modal) {
        console.log("micromodal close");
      }
    });
    
  } catch (e) {
    console.log("micromodal error: ", e);
  }
  
});

              
            
!
999px

Console