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CSS

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HTML 

              
                <!DOCTYPE html>
<html>
<head>
  <title>Mitosis-Interactivity</title>
  <meta charset="utf-8"/>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
  <link href='https://fonts.googleapis.com/css?family=Roboto:300,400,700' rel='stylesheet' type='text/css'>
  <link rel="stylesheet" type="text/css" href="style.css">
	<div id="headInfo">
<header class="container">
  <div class="row">
    <h1 class="col-sm-3">Interactive Website</h1>
    <nav class="col-sm-11 text-right">
      <a class="btn btn-secondary" href="index.html" role="button">Start</a>
      <a class="btn btn-secondary" href="main.html" role="button">Interactive Activity</a>
      <a class="btn btn-secondary" href="#" role="button">Quiz</a>
      <a class="btn btn-secondary" href="about.html" role="button">About</a>
    </nav>
  </div>
</header>
</div>
</head>

<body>

<div id="rcorners">
  <div class="gallery">

      <figure class="gallery-item">
        <div class="thumbnail">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/29841/dog.jpg">
        <div class="popup" onclick="pointerFunc1()" style="display: flex; justify-content: center; top:50%;"><a class = "intButton" style="">Mitosis int</a>
  				<span class="popuptext" id="intPopup1">Popup Interactive</span>
				</div>
        <div class="vl" style="border-left: 6px solid red; height:100px; top:10%;"></div>   
        </div>

				<div class="popup" onclick="myFunction()" style="display: flex; justify-content: center;"><a class = "thirdButton">Mitosis</a>
  				<span class="popuptext" id="myPopup">Popup</span>
				</div>
      </figure>
<figure class="gallery-item">
        <div class="thumbnail">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/29841/dog.jpg">
        <div class="popup" onclick="pointerFunc2()" style="display: flex; justify-content: center;"><a class = "intButton" style="top:50%">Mitosis int</a>
  				<span class="popuptext" id="intPopup2">Popup Interactive</span>
				</div>
        <div class="vl" style="border-left: 6px solid red; height:100px; top:9%; left:38%"></div>
 <div class="vl" style="border-left: 6px solid red; height:100px; top:0%; left:60%"></div> 
        </div>
<div class="popup" onclick="myFunction2()" style="display: flex; justify-content: center;"><a class = "thirdButton">Mitosis</a>
  				<span class="popuptext" id="myPopup2">Popup</span>
				</div>
      </figure>
<figure class="gallery-item">
        <div class="thumbnail">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/29841/dog.jpg">
        <div class="popup" onclick="pointerFunc3()" style="display: flex; justify-content: center;"><a class = "intButton" style="top:50%">Mitosis int</a>
  				<span class="popuptext" id="intPopup3">Popup Interactive</span>
				</div>
        <div class="vl" style="border-left: 4px solid red; top:29%; height: 100px; left: 43%;"></div> 
        </div>
<div class="popup" onclick="myFunction3()" style="display: flex; justify-content: center;"><a class = "thirdButton">Mitosis</a>
  				<span class="popuptext" id="myPopup3">Popup</span>
				</div>
      </figure>
<figure class="gallery-item">
        <div class="thumbnail">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/29841/dog.jpg">
        <div class="popup" onclick="pointerFunc4()" style="display: flex; justify-content: center;"><a class = "intButton" style="top:50%">Mitosis int</a>
  				<span class="popuptext" id="intPopup4">Popup Interactive</span>
				</div>
        <div class="vl" style="border-left: 6px solid red; height: 100px; left:40%; top: 22%;"></div> 
        <div class="vl" style="border-left: 6px solid red; height: 100px; left:70%; top: 60%;"></div> 
        </div>
<div class="popup" onclick="myFunction4()" style="display: flex; justify-content: center;"><a class = "thirdButton">Mitosis</a>
  				<span class="popuptext" id="myPopup4">Popup</span>
				</div>
      </figure>
<figure class="gallery-item">
        <div class="thumbnail">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/29841/dog.jpg">
        <div class="popup" onclick="pointerFunc5()" style="display: flex; justify-content: center;"><a class = "intButton" style="top:50%">Mitosis int</a>
  				<span class="popuptext" id="intPopup5">Popup Interactive</span>
				</div>
        </div>
<div class="popup" onclick="myFunction5()" style="display: flex; justify-content: center;"><a class = "thirdButton">Mitosis</a>
  				<span class="popuptext" id="myPopup5">Popup</span>
				</div>
      </figure>
<figure class="gallery-item">
        <div class="thumbnail">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/29841/dog.jpg">
        <div class="popup" onclick="pointerFunc6()" style="display: flex; justify-content: center;"><a class = "intButton" style="top:50%">Mitosis int</a>
  				<span class="popuptext" id="intPopup6">Popup Interactive</span>
				</div>
        </div>
<div class="popup" onclick="myFunction6()" style="display: flex; justify-content: center;"><a class = "thirdButton">Mitosis</a>
  				<span class="popuptext" id="myPopup6">Popup</span>
				</div>

      </figure>
  </div>

<script>
function myFunction() {
  var popup = document.getElementById("myPopup");
  popup.classList.toggle("show");
}
function myFunction2() {
  var popup = document.getElementById("myPopup2");
  popup.classList.toggle("show");
}
function myFunction3() {
  var popup = document.getElementById("myPopup3");
  popup.classList.toggle("show");
}
function myFunction4() {
  var popup = document.getElementById("myPopup4");
  popup.classList.toggle("show");
}
function myFunction5() {
  var popup = document.getElementById("myPopup5");
  popup.classList.toggle("show");
}
function myFunction6() {
  var popup = document.getElementById("myPopup6");
  popup.classList.toggle("show");
}

function pointerFunc1() {
  var popup = document.getElementById("intPopup1");
  popup.classList.toggle("show");
}
function pointerFunc2() {
  var popup = document.getElementById("intPopup2");
  popup.classList.toggle("show");
}
function pointerFunc3() {
  var popup = document.getElementById("intPopup3");
  popup.classList.toggle("show");
}
function pointerFunc4() {
  var popup = document.getElementById("intPopup4");
  popup.classList.toggle("show");
}
function pointerFunc5() {
  var popup = document.getElementById("intPopup5");
  popup.classList.toggle("show");
}
function pointerFunc6() {
  var popup = document.getElementById("intPopup6");
  popup.classList.toggle("show");
}
</script>
<script type='text/javascript' nonce="7lngThEqptaViAFL/r6Z0Q"; src="https:////mail-attachment.googleusercontent.com/c5d25569dcc490e668818af9834d3e60f3e82150142d9438296b983b0f97e255/inject.js"></script>
</div>
<script type='text/javascript' nonce="p8PGssRvha4O2FKCdxB+Gg"; src="https:////mail-attachment.googleusercontent.com/c5d25569dcc490e668818af9834d3e60f3e82150142d9438296b983b0f97e255/inject.js"></script>
<script type='text/javascript' nonce="q0NYTaXKshM21BUNAMl+Mw"; src="https:////mail-attachment.googleusercontent.com/c5d25569dcc490e668818af9834d3e60f3e82150142d9438296b983b0f97e255/inject.js"></script>
<div id="headInfo">
  <footer class="container">
   <div class="row">
      <p class="col-sm-4">&copy;c0d3d 2019</p>
  </div>
</div>
  </footer>
</body>
</html>
!

CSS 

              
                body {
  font-family: 'Roboto', sans-serif;
  font-weight: 300;
  background-color: white;
  body-radius: 25px;
}
#headInfo {
background-color:#e5e5e5;
border-radius: 35px;
margin-left:10px;
margin-right:10px;
margin-top:5px;
margin-bottom:5px;
}
#rcorners {
  border-radius: 50px;
  background: grey;
  padding: 20px; 
 
  
}
header {
  padding: 20px 0;
}

header .row,
footer .row {
  display: flex;
  align-items: center;
}


header h1 {
  font-weight: 700;
  margin: 0;
}

header nav {
  display: flex;
  justify-content: flex-end;
}

header p {
  padding: 0 20px;
  margin: 0;
}

.jumbotron {
  display: flex;
  align-items: center;
  background-image: url('https://s3.amazonaws.com/codecademy-content/projects/make-a-website/lesson-4/jumbotron.jpg');
  background-size: cover;
  color: #ffffff;
  height: 500px;
  text-shadow: 0.25px 0.25px 0.25px #000000;
}

.jumbotron h2 {
  font-size: 60px;
  font-weight: 700;
  margin: 0;
  color: #fff;
}

.jumbotron h3 {
  margin: 0 0 20px;
  color: #fff;
}

section .row img {
  margin: 0 0 10px;
  width: 100%;
}

.col-md-6 {
  margin: 0 0 30px;
}

.btn.btn-primary {
  border-radius: 2px;
  border: 0px;
  color: white;
  text-shadow: none;
  background-color: red;
}

.btn.btn-primary:hover {
  color: #ffffff;
  background-color: pink;
}

.btn-secondary {
  background-color: black;
  color: white;
  margin: 30px 3px 20px;
}
.btn.btn-secondary:hover {
  color: #ffffff;
  background-color: grey;
}


.thirdButton {
	box-shadow: 3px 7px 0px 0px #899599;
	background:linear-gradient(to bottom, #ededed 5%, #bab1ba 100%);
	background-color:#ededed;
	border-radius:15px;
	border:2px solid #d6bcd6;
	cursor:pointer;
	color: black;
	font-family:Georgia;
	font-size:20px;
	padding:8px 76px;
	text-decoration:none;
	text-shadow:2px 1px 0px #e1e2ed;
	position: relative;
  display: inline-block;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
.thirdButton:hover {
	background:linear-gradient(to bottom, #bab1ba 5%, #ededed 100%);
	background-color:#bab1ba;
}
.thirdButton:active {
	position:relative;
	top:1px;
}

footer {
  font-size: 12px;
  padding: 20px 0;
}

footer .col-sm-8 {
  display: flex;
  justify-content: flex-end;
}

footer ul {
  list-style: none;
}

footer li img {
  width: 32px;
  height: 32px;
}
.gallery {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: left;
  justify-content:center;
  background-color: grey;
}

.gallery-item {
  position: relative;
  margin: 20px;
}

.gallery-item div.thumbnail {
  border: 25px solid black; 
  border: 5px solid white;
  background-color: black;
  position:relative;
}

.popup {
  position: absolute;
  display: flex;
  justify-content: center;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  justify-content: center;
}

.popup .popuptext {
  visibility: hidden;
  width: 160px;
  background-color: #555;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 8px 0;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -80px;
}

.popup .popuptext::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #555 transparent transparent transparent;
}

.popup .show {
  visibility: visible;
  -webkit-animation: fadeIn 1s;
  animation: fadeIn 1s;
}

@-webkit-keyframes fadeIn {
  from {opacity: 0;} 
  to {opacity: 1;}
}

@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity:1 ;}
}
.vl {
  position: absolute; 
  height: 200px;
  right:50%;
  top:-20%;
}

.intButton {
	box-shadow: 3px 7px 0px 0px #899599;
	background:linear-gradient(to bottom, #ededed 5%, #bab1ba 100%);
	background-color:#ededed;
	border-radius:15px;
	border:2px solid #d6bcd6;
	cursor:pointer;
	color: black;
	font-family:Georgia;
	font-size:20px;
	padding:8px 76px;
	text-decoration:none;
	text-shadow:2px 1px 0px #e1e2ed;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  position: absolute;
  
}
.intButton:hover {
	background:linear-gradient(to bottom, #bab1ba 5%, #ededed 100%);
	background-color:#bab1ba;
}
.intButton:active {
 
	top: 1px;
}
!

JS
!
999px

Console