gallery.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="galleryStyle.css">
    <link href="https://fonts.googleapis.com/icon?family=Material+Icons"
    rel="stylesheet">

</head>
<body>

    <div class="media-container">
    </div>

    <button id="camera"><span class="material-icons">
        photo_camera
        </span></button>
    
    <script src="dbScript.js"></script>
    <script>
        setTimeout(function(){
        loadMedia();
        },100)

        let cameraBtn = document.querySelector("#camera");
        cameraBtn.addEventListener("click", function(){
            location.assign("index.html");
        })
    </script>
</body>
</html>