JSFiddle - React, Tailwind, and code Playground

HTML

<div id="overlay" style="display:none">
    <p id="instruction1">This is some instruction.<br/>
        <span id="dismiss">(tap to dismiss)</span>
    </p>
    <img id="arrow1" src="http://pixabay.com/static/uploads/photo/2013/07/13/10/13/arrow-156792_640.png" />
    <p id="instruction2">This is something cool!</p>
</div>

<main>
    <div id="maincont">This is my main content.</div>
</main>

<br/>
<div style="cursor:pointer;background:rgb(0,120,190);color:#fff;padding:10px;width:25%;text-align:center" id="clk">Click to see Instructions.</div>

CSS

*{
    margin: 0px;
    padding: 0px;
}

#overlay{
    font-family: "Comic Sans MS", cursive, sans-serif;
    position: fixed;
    width: 100%;
    height: 100%;
    margin-top: 120px;
    z-index: 999999;
    background-color: #000;
    opacity:0.5;
    -webkit-transition: all 0.3s ease-out;
    -moz-transition: all 0.3s ease-out;
    -ms-transition: all 0.3s ease-out;
    -o-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
}

#overlay p, #overlay img{
    position: relative;
}

#overlay p{
    color: blue;
}

#instruction1{
    top: 50px;
    left: 400px;
}

#arrow1{
    width: 100px;
    position: relative;
    top: -30px;
    left: 150px;
}

#instruction2{
    top: -10px;
    left: 225px;
}

#dismiss{
    font-size: 12px;
}
.shome{
    display: block;
}
main{
    z-index: 0;
}

main div{
    padding: 50px;
    background: rgb(0,120,170);color:#fff;
    z-index: 9999999;
    opacity: 0.8;
}

JavaScript

$("#overlay").on("click", function(){
  this.style.display = "none";
     $("#clk").show();
});

$("#clk").on("click", function(){
    $("#overlay").show(); 
    $("#clk").hide();
});