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HTML

              
                <html>
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
        <title>Cargo Spot</title>
        <link rel="stylesheet"/>
        </head>
        <body>
            <h1 class="w3-text-white">Cargo Spot</h1>
            <p>Hello there, Welcome to <b>Cargo Spot</b> where we sell cargo pants at the most affordable price and at their very best quality, you can add to your cart by simply clicking on the image of the cargo pant you are interested in and<br/>add to your cart. </p>
            <div>
                <img width="200px" height="200px" id="img" src="https://cdn-images.farfetch-contents.com/16/79/18/81/16791881_34907608_1000.jpg"/>
                <img width="200px" height="200px" src="https://www-konga-com-res.cloudinary.com/w_auto,f_auto,fl_lossy,dpr_auto,q_auto/media/catalog/product/I/L/61262_1620433452.jpg"/>
                <img width="200px" height="200px" src="https://encrypted-tbn3.gstatic.com/shopping?q=tbn:ANd9GcTAVgCgTtQBo5_VoMrV5SZCo3a5vC8L8_CjvkqOC2QKzNqotoETLytP76-9rKtEze61YAyfUGKrp-M&usqp=CAc"/>        
            </div>
        </body>
</html>
              
            
!

CSS

              
                body{
  background-color:black;
  color:white;
}
img {
  background-color:white;
}
              
            
!

JS

              
                var images = document.getElementsByTagName("img")[0];
images.onmouseover = function hover(){
    alert("Add to Cart")
}
              
            
!
999px

Console