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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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HTML 

              
                <section id="section-feature" class="container">
    <div class="row">
        <ul>
            <li id="sf-innovation" class="col-md-3 col-sm-6 col-xs-12">
                <div class="sf-wrap">
                    <div class="sf-mdl-left">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-rocket fa-5x"></i>
                        </div>
                        <h3>Gallia est omnis</h3>
                    </div>
                    <div class="sf-mdl-right">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-rocket fa-5x"></i>
                        </div>
                        <h3>Gallia est omnis</h3>
                    </div>

                    <div class="sf-mdl-left-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-rocket fa-5x"></i>
                        </div>
                        <h3><a href="#">Gallia est omnis</a></h3>
                        <p>Curabitur blandit tempus ardua ridiculus sed magna. Integer legentibus erat a ante historiarum dapibus.</p>
                    </div>
                    <div class="sf-mdl-right-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-rocket fa-5x"></i>
                        </div>
                        <h3><a href="#">Gallia est omnis</a></h3>
                        <p>Curabitur blandit tempus ardua ridiculus sed magna. Integer legentibus erat a ante historiarum dapibus.</p>
                    </div>
                </div>
            </li>

            <li id="sf-community" class="col-md-3 col-sm-6 col-xs-12">
                <div class="sf-wrap">
                    <div class="sf-mdl-left">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-camera-retro fa-5x"></i>
                        </div>
                        <h3>Donec sed operae</h3>
                    </div>
                    <div class="sf-mdl-right">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-camera-retro fa-5x"></i>
                        </div>
                        <h3>Donec sed operae</h3>
                    </div>

                    <div class="sf-mdl-left-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-camera-retro fa-5x"></i>
                        </div>
                        <h3><a href="#">Donec sed operae</a></h3>
                        <p>Hi omnes lingua, institutis, legibus inter se differunt. Donec sed odio operae, eu vulputate felis rhoncus.</p>
                    </div>
                    <div class="sf-mdl-right-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-camera-retro fa-5x"></i>
                        </div>
                        <h3><a href="#">Donec sed operae</a></h3>
                        <p>Hi omnes lingua, institutis, legibus inter se differunt. Donec sed odio operae, eu vulputate felis rhoncus.</p>
                    </div>
                </div>
            </li>

            <li id="sf-academy" class="col-md-3 col-sm-6 col-xs-12">
                <div class="sf-wrap">
                    <div class="sf-mdl-left">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-cloud-upload fa-5x"></i>
                        </div>
                        <h3>Hi omnes lingua</h3>
                    </div>
                    <div class="sf-mdl-right">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-cloud-upload fa-5x"></i>
                        </div>
                        <h3>Hi omnes lingua</h3>
                    </div>

                    <div class="sf-mdl-left-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-cloud-upload fa-5x"></i>
                        </div>
                        <h3><a href="#">Hi omnes lingua</a></h3>
                        <p>Nec dubitamus multa iter quae et nos invenerat. Ullamco laboris nisi ut aliquid ex ea commodi consequat.</p>
                    </div>
                    <div class="sf-mdl-right-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-cloud-upload fa-5x"></i>
                        </div>
                        <h3><a href="#">Hi omnes lingua</a></h3>
                        <p>Nec dubitamus multa iter quae et nos invenerat. Ullamco laboris nisi ut aliquid ex ea commodi consequat.</p>
                    </div>
                </div>
            </li>

            <li id="sf-opportunity" class="col-md-3 col-sm-6 col-xs-12">
                <div class="sf-wrap">
                    <div class="sf-mdl-left">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-star-half-o fa-5x"></i>
                        </div>
                        <h3>Idque Caesaris facere</h3>
                    </div>
                    <div class="sf-mdl-right">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-star-half-o fa-5x"></i>
                        </div>
                        <h3>Idque Caesaris facere</h3>
                    </div>

                    <div class="sf-mdl-left-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-star fa-5x"></i>
                        </div>
                        <h3><a href="#">Idque Caesaris facere</a></h3>
                        <p>Morbi fringilla convallis sapien, id pulvinar odio volutpat. Contra legem facit qui id facit quod lex prohibet.</p>
                    </div>
                    <div class="sf-mdl-right-full">
                        <div class="sf-icon">
                            <i class="fa fa-fw fa-star fa-5x"></i>
                        </div>
                        <h3><a href="#">Idque Caesaris facere</a></h3>
                        <p>Morbi fringilla convallis sapien, id pulvinar odio volutpat. Contra legem facit qui id facit quod lex prohibet.</p>
                    </div>
                </div>
            </li>
        </ul>
    </div>
</section>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Raleway:300,400,500,600,800);

body {
    font-size: 16px;
    line-height: 22px;
    color: #555;
    font-family: 'Raleway', sans-serif;
    font-weight: 300;
    text-shadow: rgba(0,0,0,.01) 0 0 1px;
}

#section-feature ul {
    margin: 100px 0 0 0;
    padding: 0;
    list-style: none;
    position: relative;
}

#section-feature li {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    position: relative;
    height: 240px;
    padding: 2%;
    float: left;
    margin-bottom: 40px;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#section-feature .sf-wrap {
    background-repeat: no-repeat;
    position: absolute;
    max-width: 280px;
    width: 100%;
    height: 100%;
    left: 50%;
    margin-left: -140px;
    top: 0;
    -moz-perspective: 600px;
    -webkit-perspective: 600px;
    -ms-perspective: 600px;
    -o-perspective: 600px;
    perspective: 600px;
    cursor: pointer;
}

.sf-mdl-left,
.sf-mdl-right,
.sf-mdl-left-full,
.sf-mdl-right-full {
    position: absolute;
    left: 0;
    top: 0;
    width: 50%;
    height: 100%;
    -webkit-transition: all .5s;
    -moz-transition: all .5s;
    -ms-transition: all .5s;
    -o-transition: all .5s;
    transition: all .5s;
    overflow: hidden;
}

.sf-icon {
    position: absolute;
    top: 30px;
    text-align: center;
    width: 100%;
    left: 0;
    width: 200%;
    color: #e4610e;
}


.sf-mdl-left-full .sf-icon,
.sf-mdl-right-full .sf-icon {
    color: #fff;
}

.sf-mdl-right,
.sf-mdl-right-full {
    left: auto;
    right: 0;
}

.sf-mdl-left-full,
.sf-mdl-right-full {
    background-color: #333;
    z-index: 9;
    color: #fff;
}

.sf-wrap a {
    color: #e4610e;
    text-decoration: none;
}

.sf-mdl-left,
.sf-mdl-right {
    background-color: #fff;
    z-index: 10;
}

.sf-wrap > .sf-mdl-right-full,
.sf-wrap > .sf-mdl-right {
    background-position: right -30px;
}

.sf-wrap > .sf-mdl-right,
.sf-wrap > .sf-mdl-left-full {
    -moz-backface-visibility: hidden;
    -moz-transform-style: preserve-3d;
    -moz-transform-origin: 0 0;
    -moz-transform: rotateY(0deg);

    -webkit-backface-visibility: hidden;
    -webkit-transform-style: preserve-3d;
    -webkit-transform-origin: 0 0;
    -webkit-transform: rotateY(0deg);

    -o-backface-visibility: hidden;
    -o-transform-style: preserve-3d;
    -o-transform-origin: 0 0;
    -o-transform: rotateY(0deg);

    backface-visibility: hidden;
    transform-style: preserve-3d;
    transform-origin: 0 0;
    transform: rotateY(0deg);
}

.sf-wrap.hover > .sf-mdl-right {
    -webkit-transform: rotateY(-45deg);
    -moz-transform: rotateY(-45deg);
    -ms-transform: rotateY(-45deg);
    -o-transform: rotateY(-45deg);
    transform: rotateY(-45deg);
    background-color: #ececec;
}

.sf-wrap > .sf-mdl-left-full {
    -moz-transform-origin: 100% 0;
    -webkit-transform-origin: 100% 0;
    -o-transform-origin: 100% 0;
    transform-origin: 100% 0;
    -moz-transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -o-transform: rotateY(180deg);
    transform: rotateY(180deg);
}

.sf-wrap.active > .sf-mdl-right,
.sf-wrap.hover.active > .sf-mdl-right {
    -moz-transform: rotateY(-180deg);
    -webkit-transform: rotateY(-180deg);
    -o-transform: rotateY(-180deg);
    transform: rotateY(-180deg);
}

.sf-wrap.active > .sf-mdl-left-full {
    -moz-transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
    -o-transform: rotateY(0deg);
    transform: rotateY(0deg);
}

.active .sf-mdl-left-full,
.active .sf-mdl-right-full {
    z-index: 11;
}

.sf-wrap div h3 {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 22px;
}

.sf-wrap div h3,
.sf-wrap div p {
    width: 200%;
    position: absolute;
    text-align: center;
    left: 0;
    top: 140px;
}

.sf-wrap div p {
    padding: 0 10%;
    line-height: 18px;
    font-size: 13px;
    top: 170px;
}

.sf-wrap div.sf-mdl-right h3,
.sf-wrap div.sf-mdl-right-full h3,
.sf-wrap div.sf-mdl-right p,
.sf-wrap div.sf-mdl-right-full p,
.sf-mdl-right .sf-icon,
.sf-mdl-right-full .sf-icon
{
    left: auto;
    right: 0;
}

.sf-wrap div.sf-mdl-left-full h3,
.sf-wrap div.sf-mdl-right-full h3 {
    top: 115px;
}
!

JS 

              
                $(function () {
    $('#section-feature .sf-wrap')
        .hover(function() {
            $(this).addClass('hover');
        }, function() {
            $(this).removeClass('hover');
        })
        .click(function(event) {
            //if (event.target.nodeName != 'A') {
                $(this).toggleClass('active');
            //}
        });
});
!
999px

Console