JSFiddle - React, Tailwind, and code Playground

HTML

<div id="background">
    <div id="box">
        <div class="title">TITLE OF WEBSITE</div>
        <div class="text" id="text-box">Text corresponding to the specfic background shown.</div>
        <div class="button">
            <button type="button" id="my-button">Randomizing button</button>
        </div>
    </div>
</div>

CSS

html, body {
    height: 100%;
}
#background {
    height: 100%;
}
#box {
    background: #fff;
    width: 40%;
    min-width: 400px;
    height: 200px;
    margin-left: auto;
    margin-right: auto;
    top: 40%;
    position: relative;
}
.title {
    width: 100%;
    height: 50px;
    float: left;
    background: #e1e1e1;
    text-align: center;
    font-size: 24px;
    line-height:50px;
}
.text {
    background: #c8c8c8;
    width: 100%;
    height: 100px;
    float: left;
    text-align: center;
    font-size: 18px;
    position: relative;
    padding-top: 20px;
}
.button {
    width: 100%;
    height: 50px;
    float: left;
    text-align: center;
    background: #afafaf;
}

JavaScript

var myData = {
    1: {
        imageUrl: "http://lorempixel.com/800/800/cats/1",
        text: "This is the text for image 1"
    }, 
    2: {
        imageUrl: "http://lorempixel.com/800/800/cats/2",
        text: "This is the text for image 2"
    }, 
    3: {
        imageUrl: "http://lorempixel.com/800/800/cats/3",
        text: "This is the text for image 3"
    }, 
    4: {
        imageUrl: "http://lorempixel.com/800/800/cats/4",
        text: "This is the text for image 4"
    }, 
    5: {
        imageUrl: "http://lorempixel.com/800/800/cats/5",
        text: "This is the text for image 5"
    }, 
    6: {
        imageUrl: "http://lorempixel.com/800/800/cats/6",
        text: "This is the text for image 6"
    }, 
    7: {
        imageUrl: "http://lorempixel.com/800/800/cats/7",
        text: "This is the text for image 7"
    }, 
    8: {
        imageUrl: "http://lorempixel.com/800/800/cats/8",
        text: "This is the text for image 8"
    }, 
    9: {
        imageUrl: "http://lorempixel.com/800/800/cats/9",
        text: "This is the text for image 9"
    }, 
    10: {
        imageUrl: "http://lorempixel.com/800/800/cats/10",
        text: "This is the text for image 10"
    }
};
function changeImage(){
    var randomNumber = Math.floor((Math.random() * 10) + 1);
    document.getElementById("background").style.background = "url('"+myData[randomNumber].imageUrl+"')";
    document.getElementById("text-box").innerHTML = myData[randomNumber].text;
}
document.getElementById("my-button").addEventListener("click",changeImage);