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              <div class="modal-overlay" id="modal-overlay"></div>

<div class="modal" id="modal">
  <button class="close-button" id="close-button">Obvious Close Button</button>
  <div class="modal-guts">
    <h1>Modal Example</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Repudiandae expedita corrupti laudantium aperiam, doloremque explicabo ipsum earum dicta saepe delectus totam vitae ipsam doloribus et obcaecati facilis eius assumenda, cumque.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Repudiandae expedita corrupti laudantium aperiam, doloremque explicabo ipsum earum dicta saepe delectus totam vitae ipsam doloribus et obcaecati facilis eius assumenda, cumque.</p>
    
  </div>
</div>

<button id="open-button" class="open-button">Open Button</button>
            
          
!
            
              @import 'https://fonts.googleapis.com/css?family=Prompt:400,700';

.modal {
  /* This way it could be display flex or grid or whatever also. */
  display: block;
  
  /* Probably need media queries here */
  width: 600px;
  max-width: 100%;
  
  height: 400px;
  max-height: 100%;
  
  position: fixed;
  
  z-index: 100;
  
  left: 50%;
  top: 50%;
  
  /* Use this for centering if unknown width/height */
  transform: translate(-50%, -50%);
  
  /* If known, negative margins are probably better (less chance of blurry text). */
  /* margin: -200px 0 0 -200px; */
  
  background: white;
  box-shadow: 0 0 60px 10px rgba(0, 0, 0, 0.9);
}
.closed {
  display: none;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 50;
  
  background: rgba(0, 0, 0, 0.6);
}
.modal-guts {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  padding: 20px 50px 20px 20px;
}



* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  background-color:#556;
  background-image: linear-gradient(30deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445),
  linear-gradient(150deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445),
  linear-gradient(30deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445),
  linear-gradient(150deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445),
  linear-gradient(60deg, #99a 25%, transparent 25.5%, transparent 75%, #99a 75%, #99a), 
  linear-gradient(60deg, #99a 25%, transparent 25.5%, transparent 75%, #99a 75%, #99a);
  background-size:80px 140px;
  background-position: 0 0, 0 0, 40px 70px, 40px 70px, 0 0, 40px 70px;
  
  font-family: 'Prompt', sans-serif;
}
ul {
  margin: 10px 0 10px 30px;
}
li, p {
  margin: 0 0 10px 0;
}
h1 {
  margin: 0 0 20px 0;
}

.modal .close-button {
  position: absolute;
  
  /* don't need to go crazy with z-index here, just sits over .modal-guts */
  z-index: 1;
  
  top: 10px;
  
  /* needs to look OK with or without scrollbar */
  right: 20px;
  
  border: 0;
  background: black;
  color: white;
  padding: 5px 10px;
  font-size: 1.3rem;
}

.open-button {
  border: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: lightgreen;
  color: white;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 21px;
}
            
          
!
            
              var modal = document.querySelector("#modal");
var modalOverlay = document.querySelector("#modal-overlay");
var closeButton = document.querySelector("#close-button");
var openButton = document.querySelector("#open-button");

closeButton.addEventListener("click", function() {
  modal.classList.toggle("closed");
  modalOverlay.classList.toggle("closed");
});

openButton.addEventListener("click", function() {
  modal.classList.toggle("closed");
  modalOverlay.classList.toggle("closed");
});
            
          
!
999px
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