JSFiddle - React, Tailwind, and code Playground

by ChaseWest

HTML

<section id="home"> <span>Home</span>

</section>
<section id="about"> <span>About</span>

</section>
<section id="contact"> <span>Contact</span>

</section>
<section id="gallery"> <span>Gallery</span>

</section>

CSS

html, body {
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
}
section {
    position: absolute;
    display: table;
    width: 50%;
    height: 50%;
    background: gray;
    color: pink;
    float: left;
    text-align: center;
    font-size: 60px;
    opacity: .7;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    -webkit-transition: all .25s ease-in-out;
    -moz-transition: all .25s ease-in-out;
    -o-transition: all .25s ease-in-out;
    transition: all .25s ease-in-out;
}
section:hover {
    opacity: 1;
    color: white;
    background: gray;
    cursor: pointer;
    -webkit-transition: width height .25s ease-in-out;
    -moz-transition: width height .25s ease-in-out;
    -o-transition: width height .25s ease-in-out;
    transition: width height .25s ease-in-out;
}
section span {
    display: table-cell;
    vertical-align: middle;
}
.main{
    z-index: 1;
    opacity: 1;
    width: 100%;
    height: 100%;
    
}
#home {
    top: 0;
    left: 0;
    background: url(https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-xfa1/t31.0-8/10633990_10102213024577930_5510969667862903406_o.jpg) no-repeat center center;
}
#about {
    top: 0;
    right: 0;
    background: url(https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-xpf1/t31.0-8/p960x960/10470267_10102253403992260_4491166039345883547_o.jpg) no-repeat center center;
}
#contact {
    bottom: 0;
    left: 0;
    background: url(https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/t31.0-8/p960x960/10712634_10102251318167270_7463290681888298858_o.jpg) no-repeat center center;
}
#gallery {
    bottom: 0;
    right: 0;
    background: url(https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xaf1/t31.0-8/p960x960/1911972_10102253401058140_5451743774625491451_o.jpg) no-repeat center center;
}

JavaScript

$("section").on("click", addRemoveMain);

function addRemoveMain(e){
    var $this = $(this);
    
    if(!$this.hasClass("main")){
        $this.addClass("main");
    } else {
        $this.removeClass("main");
    }
}