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HTML 

              
                <div class="button-container">
  <button type="button" data-modal-id="my-modal" class="launch">Trailer Embed</button>
  <button type="button" data-modal-id="my-other-modal" class="launch">Launch second Modal</button>
</div>

<div class="modal-container" id="modal-container">
  
  <div class="modal" id="my-modal">
    <iframe width="560" height="315" src="https://www.youtube.com/embed/XFYWazblaUA" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
    <button type="button" class="close">
<svg width="13px" height="13px" viewBox="0 0 13 13" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 48.2 (47327) - http://www.bohemiancoding.com/sketch -->
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="Close" transform="translate(-29.000000, -47.000000)" fill="#D8D8D8">
            <g id="Close-X-2" transform="translate(29.000000, 47.000000)">
                <path d="M6.36396103,4.94974747 L11.3137085,1.77635684e-15 L12.7279221,1.41421356 L7.77817459,6.36396103 L12.7279221,11.3137085 L11.3137085,12.7279221 L6.36396103,7.77817459 L1.41421356,12.7279221 L-1.42108547e-14,11.3137085 L4.94974747,6.36396103 L-1.24344979e-14,1.41421356 L1.41421356,8.8817842e-16 L6.36396103,4.94974747 Z" id="Combined-Shape"></path>
            </g>
        </g>
    </g>
</svg></button></div>
  
  <div class="modal" id="my-other-modal">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis porttitor felis ac urna elementum, ac tristique lacus malesuada. Integer tempor aliquam efficitur.</p>
    <p>Donec eu est fermentum, consequat mauris id, laoreet nunc. Duis aliquam bibendum dolor at iaculis. Quisque id elementum erat. Nam sed suscipit metus. Sed a eros augue.</p>
    <p>Mauris sed ante fermentum, malesuada risus vel, tincidunt augue. Proin venenatis erat vitae nibh scelerisque, sit amet molestie turpis ultrices.
</p>
    <button type="button" class="close">
<svg width="13px" height="13px" viewBox="0 0 13 13" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 48.2 (47327) - http://www.bohemiancoding.com/sketch -->
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="Close" transform="translate(-29.000000, -47.000000)" fill="#D8D8D8">
            <g id="Close-X-2" transform="translate(29.000000, 47.000000)">
                <path d="M6.36396103,4.94974747 L11.3137085,1.77635684e-15 L12.7279221,1.41421356 L7.77817459,6.36396103 L12.7279221,11.3137085 L11.3137085,12.7279221 L6.36396103,7.77817459 L1.41421356,12.7279221 L-1.42108547e-14,11.3137085 L4.94974747,6.36396103 L-1.24344979e-14,1.41421356 L1.41421356,8.8817842e-16 L6.36396103,4.94974747 Z" id="Combined-Shape"></path>
            </g>
        </g>
    </g>
</svg></button></div>
  
</div>

  <p>You should probably check out this <a target="_blank" href="https://codepen.io/bdnorris/pen/gOpbaxP">accessible modal codepen instead.</p>
!

CSS 

              
                $primary: #0288D1;
$secondary: #CFD8DC;

@mixin button-reset {
  border: none;
  background: none;
  color: inherit;
  padding: 0;
  margin: 0;
  font-family: inherit;
  box-shadow: none;
}

body {
  font-family: 'Fira Sans', sans-serif;
}

p {
  line-height: 1.4;
  text-align: center;
}

.button-container {
  width: 100vw;
  height: 80vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

button.launch {
  @include button-reset;
  padding: 0.666em 1em;
  background-color: $primary;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 1em;
  border-radius: 6px;
}

.modal-container {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.2);
  display: none;
  z-index: 100;
  // Safari issue fixes
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  &.active {
    display: flex;
    justify-content: center;
    align-items: center;
  }
}

.modal {
  display: none;
  opacity: 0;
  padding: 3em;
  margin: auto;
  background-color: white;
  position: relative;
  z-index: 101;
  max-width: 70vw;
  max-height: 70vh;
  overflow: auto;
  // Safari Issue fixes
    -webkit-transform: translate3d(0,0,0);
  &.active {
    display: block;
    opacity: 1;
    animation: slide-in-fwd-top 0.4s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
  }
  button.close {
    @include button-reset;
    position: absolute;
    top: 0.5em;
    right: 0.5em;
    padding: 0.5em;
  }
}



/* ----------------------------------------------
 * Generated by Animista on 2018-1-9 20:45:42
 * w: http://animista.net, t: @cssanimista
 * ---------------------------------------------- */

/**
 * ----------------------------------------
 * animation slide-in-fwd-top
 * ----------------------------------------
 */

@keyframes slide-in-fwd-top {
  0% {

            transform: translateZ(-1400px) translateY(-800px);
    opacity: 0;
  }
  100% {

            transform: translateZ(0) translateY(0);
    opacity: 1;
  }
}
!

JS 

              
                //https://css-tricks.com/snippets/javascript/loop-queryselectorall-matches/
// forEach method, could be shipped as part of an Object Literal/Module
function forEach(array, callback, scope) {
  for (var i = 0; i < array.length; i++) {
    callback.call(scope, i, array[i]); // passes back stuff we need
  }
}

// Get all modal buttons into a node-list
var modalButtons = document.querySelectorAll("[data-modal-id]");

// Get all modals into a node-list
var allModals = document.querySelectorAll(".modal");

// Cache a reference to the modal container
var modalContainer = document.getElementById("modal-container");

// Add an event to the container to close
if (typeof modalContainer !== "undefined" && modalContainer) {
  modalContainer.addEventListener("click", function(e) {
    console.log(e.target);
    console.log(this);
    if (e.target === this) {
      closeModal(this, "from screen");
    } else {
      // ignore click because it's not directly on the container screen
    }
  });
}

// run through all modal buttons and add event listeners
if (typeof modalButtons !== "undefined" && modalButtons) {
  forEach(modalButtons, function(index, value) {
    // get the data attribute id
    let modalId = value.getAttribute("data-modal-id");
    // add event listeners to each modal to run our function
    value.addEventListener("click", function() {
      handleModal(index, modalId);
    });
  });
}

if (typeof allModals !== "undefined" && allModals !== null) {
  forEach(allModals, function(index, value) {
    // cache a nodelist of the close button inside the modal
    let button = value.querySelectorAll(".close");
    // add event listeners to each close button inside the modals
    button[0].addEventListener("click", function() {
      closeModal(value, "button close");
    });
  });
}

function handleModal(i, id) {
  // just in case, clear any other active modals
  forEach(allModals, function(index, value) {
    value.classList.remove("active");
    if (allModals[index].id === id) {
      allModals[index].classList.add("active");
    }
  });
  // add an active class to the desired modal
  // allModals[i].classList.add("active");
  // add an active class to the container as well
  modalContainer.classList.add("active");
}

function closeModal(modal, source) {
  if (source === "from button") {
    // if we're closing from a button, remove the active class from the surrounding modal
    modal.path[1].classList.remove("active");
  } else {
    // otherwise, remove the active class from the container and ...
    modalContainer.classList.remove("active");
    forEach(allModals, function(index, value) {
      // remove the active class from all modals
      modal.classList.remove("active");
    });
  }
}
!
999px

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