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HTML 

              
                <html lang="en">
<head>
  <title>Gallery | Portfolio</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="author" content="Luznery Vera">
</head>

<!-- Code of the Professors Dr Matthew Yee-King and Dr Marco Gillies from the University of London -->
<!-- I used the bootstrap libraries and w3 school -->
<!-- Container (navbar Section) -->
<body id="myPage" data-spy="scroll" data-target=".navbar" data-offset="60">

<nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <a class="navbar-brand w3-container w3-center w3-animate-opacity" href="portfolio.html">Portfolio</a>
    </div>
    <ul class="nav navbar-nav">
      <li class=""><a href="me.html">Me</a></li>
      <li class="dropdown active"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Works<span class="caret"></span></a>
        <ul class="dropdown-menu">
          <li class="active"><a href="#">Gallery</a></li>
          <li><a href="#">SlideShow</a></li>
          <li><a href="#">eReader</a></li>
        </ul>
      </li>
      <li><a href="#"><span class="glyphicon glyphicon-phone"></span>Contact</a></li>
    </ul>
  </div>
</nav><!-- End navbar Section -->

<!-- Container (Image Gallery) -->
<div class="w3-container text-center w3-animate-opacity">
    <h1>Image Gallery</h1>

    <!--
       These are the thumbnail images.
       They are laid out using the 
       bootstrap grid.
       I have given them all the class
       "crop-image" which I use in the
       css and the javascript code.
    -->
    <div class="row">
      <div class="col-md-3 w3-hover-opacity">
        <img class="crop-img" 
          src="https://3.bp.blogspot.com/-xtp2d4xB6_M/V_WLcW5m-eI/AAAAAAAAAag/zGfpc0BfS949pecObmPW5c3qzXnJeGZmwCLcB/s1600/bouquet-15308_1920.jpg" alt="Bouquet pink tulips"/> 
      </div>
      <div class="col-md-3 w3-hover-opacity">
        <img class="crop-img"  
          src="https://1.bp.blogspot.com/-et5lUaBJMEI/V_WOCydAYcI/AAAAAAAAAaw/43eNFxDPv0Q_le6ccIdxR4OsIQUW6Az8wCLcB/s1600/tulips-1405406_1920.jpg" alt="Tulips various colors"/> 
      </div>
      <div class="col-md-3 w3-hover-opacity">
        <img class="crop-img" 
          src="https://3.bp.blogspot.com/-wIA2bKmePKA/V_WLblRRfII/AAAAAAAAAac/Tfam2kBAmLwc0A8hDZ_ODbu3jcYzLGBrgCLcB/s1600/tulips-56423_1920.jpg" alt="Tulips at night"/> 
      </div>
      <div class="col-md-3 w3-hover-opacity">
        <img class="crop-img" 
          src="https://4.bp.blogspot.com/-VynRTc_Na9I/V_WQND72r9I/AAAAAAAAAbQ/aa_xv3iTqusPg6VVXEKH-ouFVU44GFVygCLcB/s1600/flower-1451676_1920.jpg" alt="purple flowers"/> 
      </div>
     <div class="col-md-3 w3-hover-opacity">
        <img class="crop-img" 
          src="https://2.bp.blogspot.com/-DxQewoGXbLw/V_WP0WUgViI/AAAAAAAAAbI/LtJ6WgwI30MQOtI2kg67ErFoCymPctv7ACLcB/s1600/flowers-260894.jpg" alt="flowers and alliances"/> 
      </div>
    <div class="col-md-3 w3-hover-opacity">
      <img class="crop-img" 
        src="https://2.bp.blogspot.com/-aa1aglSo4XQ/V_WO5dCcxaI/AAAAAAAAAa4/thN2GBjgxPkuCyrY_LZYhRTCTWe1XoyLgCLcB/s1600/roses-1229148_1920.jpg" alt="Roses various colors"/> 
      </div>   
    <div class="col-md-3 w3-hover-opacity">
      <img class="crop-img" 
        src="https://4.bp.blogspot.com/-BHd3WqMKhas/V_WQLHYsYfI/AAAAAAAAAbM/1njQdFpUOG09WgQ3sJ-zKSYCIdvZ8XmXwCLcB/s1600/flowers-1325012_1920.jpg" alt="pink carnations"/> 
      </div>
    <div class="col-md-3 w3-hover-opacity">
      <img class="crop-img" 
        src="https://4.bp.blogspot.com/-X6w4rsL6IFc/V_WO_sbVa-I/AAAAAAAAAa8/00fWbkbSOy0puqlbn8R-Hbozcp2J0hADgCLcB/s1600/roses-1477992_1920.jpg" alt="pink roses"/> 
      </div>
    <div class="col-md-3 w3-hover-opacity">
      <img class="crop-img" 
        src="https://1.bp.blogspot.com/-BsSzatjdldU/V_WQbb2Pt4I/AAAAAAAAAbY/qny7wqXgEgg4zgg-9GUfnDm8-nuwQyXoQCLcB/s1600/frozen-201495_1920.jpg" alt="cherry on snow"/> 
      </div>
    <div class="col-md-3 w3-hover-opacity">
      <img class="crop-img" 
        src="https://2.bp.blogspot.com/-FU4cfzY-vYc/V_WRC66VXjI/AAAAAAAAAbk/lBvng5z6rNgePbQrqmGWlLv6XJ7K70yOgCLcB/s1600/cherry-blossom-1350172_1920.jpg" alt="cherry blossom"/> 
      </div>
    <div class="col-md-3 w3-hover-opacity">
      <img class="crop-img" 
        src="https://3.bp.blogspot.com/--4UAorcFHig/V_WRPe43ZuI/AAAAAAAAAbs/VZx6JjcBPgUA8MYOdGeEvbM94hN3QOu-QCLcB/s1600/winter-flowers-1200013_1920.jpg" alt="winter flowers"/> 
      </div>
    <div class="col-md-3 w3-hover-opacity">
      <img class="crop-img" 
        src="https://2.bp.blogspot.com/-PA2VtScuOf0/V_WQ-9hmATI/AAAAAAAAAbg/cMsN2RnwMPktP3HiBBMouAG_YhIZ3rH6gCLcB/s1600/rose-1146368_1920.jpg" alt="winter rose"/> 
      </div>
    </div>
    <!--
      this is the large image which is
      on a row of its own. 
      I will change it source in the 
      javascript
    -->
    <div class="row">
      <div class="col-md-12">
        <img id="bigImage" 
          class="large-img" 
          src="https://2.bp.blogspot.com/-DxQewoGXbLw/V_WP0WUgViI/AAAAAAAAAbI/LtJ6WgwI30MQOtI2kg67ErFoCymPctv7ACLcB/s1600/flowers-260894.jpg" alt="flowers and alliances"/> 
      </div>
    </div>
  </div><!-- End Image Gallery -->
    
<!-- footer -->
<footer class="container-fluid text-center bg-3">
  <a href="#myPage" title="To Top">
    <span class="glyphicon glyphicon-chevron-up" style="font-size: 30px;"></span>
  </a><p>Build a Responsive Web Page for the course <a href="https://www.coursera.org/learn/website-coding" target="_blank">Responsive website basics</a> By<a href="https://twitter.com/LuzneryVera" target="_blank"> @LuzneryVera</a> Responsive website basics is the first course of specialization program <a href="https://www.coursera.org/specializations/website-development" target="_blank">Responsive Website Development and Design</a> created by University of London & Goldsmiths and University of London through Coursera.</p><p>&copy; Copyright 2016 Luznery Vera</p><img class="logo-u" src="https://2.bp.blogspot.com/-EtcSWLAyoHY/V_WLLf6XqpI/AAAAAAAAAaY/7Kppc58ytBQPqW3QwCjHqH73MRTCSkzegCLcB/s1600/University-of-London.jpg" alt="Logo"><img class="logo-c" src="https://1.bp.blogspot.com/-t0wj80EtIJY/V_WKj-nYrNI/AAAAAAAAAaQ/Ovv5r90Xpw4lysAJtLMEqNv7GnuzxmA5ACLcB/s1600/coursera_logo.png" alt="Logo">
</footer><!-- End footer -->

	</body>
</html>
!

CSS 

              
                /* Gallery */
/* Style header */
 .navbar {
      padding-top: 20px;
      border: 0;
      border-radius: 0;
      margin-bottom: 0;
      font-size: 16px;
      letter-spacing: 5px;
      color: #fff;
      background: linear-gradient(#051118, #681B6C);
      width: 100%;
      font-weight: bold;
  }

/* Style dropdown-menu. If hovering change the background color and font color and more */
.dropdown-menu a:hover {background-color: #f1f1f1;
color: #0FB5FF;}

  .navbar-header a {
    font-size: 22px !important;
    color: #fff !important;  
  }

  .navbar-nav  li a:hover {
      color: #E00004 !important;
  }

  .navbar-nav li a {
  color: #fff;
  }

ul .dropdown-menu li a {
  border-color: none !important;
 color: #0056AA;
}

ul .dropdown-menu:hover {
box-shadow: 0 4px 8px 0 rgba(104, 27, 108, 0.40), 0 6px 50px 0 rgba(104, 27, 108, 0.40);
}

/* Style "h1" */
h1 {
  margin-top: 100px;
  text-shadow: 0 1px 3px rgba(0,0,0,.5); 
}

/* Style for links */
a {
  color:  #6FC4F0;
  text-decoration: none; 
  }

 a:hover {
 color: #f4511e;
 }

/* Style footer */
.bg-3 {
      background-color: #48003B;
      color: #fff;
      font-size: 17px;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      padding-top: 30px;
      padding-bottom: 30px;     
  }

/* Style Image Gallery */
.crop-img {
  padding-top: 10px;

}

.col-md-12 {
	margin: 5px;
}

.logo-u {
  width: 130px;
  border: none;
 }

 .logo-c {
  width: 170px;
  border: none;
 }

.glyphicon-chevron-up a:hover {
color: #E00004;
  }

.glyphicon-chevron-up {
  margin: 10px;
  text-align: center;
  font-size: 20px;
}

.glyphicon-chevron-up a:hover {
color: #f4511e !important;
  }
 
/* this is for the thumbnail images */
.crop-img{
  max-height:150px;
  max-width:100%;
}

/* this is for the big main image */
.large-img{
  max-width:70%;
}
!

JS 

              
                    // jQuery Image Gallery 
    // when we click on the thumbnail
    // we set the src attribute of the 
    // bit image to be the same as the 
    // src of the image we have clicked on
    // ("this"). This loads the same
    // image file into the big image
    $(".crop-img").click(function(){
      $("#bigImage").attr('src', 
        $(this).attr('src'));
    });// End jQuery Image Gallery
!
999px

Console