This code is a grid of 9 photos, each of which is enlarged in hover mode. In fact, Thumbnail is a beautiful effect in hover mode that makes you can see the photo more clearly. Creating a Thumbnail effect in hover mode is used in pure css For this reason, it is very efficient for sites that face limitations such as jquery or javascript and wants the site to be lighter, and it has a special appeal.


HTML
<!-- This script got from www.devanswer.com  -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>

<div class="wrapper">
        <div class="gallery">
                <ul>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                        <li><img src="http://devanswer.com/codes/files/flower.jpg"></li>
                </ul>
        </div>
</div><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com ">Developers Answer</a></div>
                        

CSS
  @import url(https://fonts.googleapis.com/css?family=Roboto+Condensed:700);

    html, body, div, span, applet, object, iframe,
    h1, h2, h3, h4, h5, h6, p, blockquote, pre,
    a, abbr, acronym, address, big, cite, code,
    del, dfn, em, img, ins, kbd, q, s, samp,
    small, strike, strong, sub, sup, tt, var,
    b, u, i, center,
    dl, dt, dd, ol, ul, li,
    fieldset, form, label, legend,
    table, caption, tbody, tfoot, thead, tr, th, td,
    article, aside, canvas, details, embed,
    figure, figcaption, footer, header, hgroup,
    menu, nav, output, ruby, section, summary,
    time, mark, audio, video {
        margin: 0;
        padding: 0;
        border: 0;
        font-size: 100%;
        font: inherit;
        vertical-align: baseline;
    }

    body {
        background-color: #f2f2f2;
    }

    header {
        width: 100%;
        background-color: #77cdb4;
        text-align: center;
    }

    h1 {
        font-family: 'Roboto Condensed', sans-serif;
        color: #FFF;
        font-size: 2.3em;
    }

    em {
        color: #232027;
    }

    .wrapper {
        width: 40%;
        margin: 40px auto;
    }

    div.gallery {
        margin-top: 30px;
    }

        div.gallery ul {
            list-style-type: none;
            margin-left: 35px;
        }

            /* animation */
            div.gallery ul li, div.gallery li img {
                -webkit-transition: all 0.1s ease-in-out;
                -moz-transition: all 0.1s ease-in-out;
                -o-transition: all 0.1s ease-in-out;
                transition: all 0.1s ease-in-out;
            }

            div.gallery ul li {
                position: relative;
                float: left;
                width: 130px;
                height: 130px;
                margin: 5px;
                padding: 5px;
                z-index: 0;
            }

                /* Make sure z-index is higher on hover */
                /* Ensure that hover image overlapped the others */
                div.gallery ul li:hover {
                    z-index: 5;
                }

                /* Image is position nicely under li */
                div.gallery ul li img {
                    position: absolute;
                    left: 0;
                    top: 0;
                    border: 1px solid #dddddd;
                    padding: 5px;
                    width: 130px;
                    height: 130px;
                    background: #f0f0f0;
                }

                    div.gallery ul li img:hover {
                        width: 200px;
                        height: 200px;
                        margin-top: -130px;
                        margin-left: -130px;
                        top: 65%;
                        left: 65%;
                    }

    p.attribution {
        font-family: 'Consolas';
        color: #000;
        clear: both;
        text-align: center;
        line-height: 25px;
        padding-top: 30px;
    }

        p.attribution a {
            color: #4c8d7c;
        }

    /* Responsive hack */
    @media only screen and (min-width: 499px) and (max-width: 1212px) {
        .wrapper {
            width: 500px;
        }
    }

    @media only screen and (max-width: 498px) {
        .wrapper {
            width: 300px;
        }

        div.gallery ul {
            list-style-type: none;
            margin: 0;
        }
    }