style.css

body {
 margin: 0;
 padding: 0;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: center;
 height: 100vh;
 background-color: #f5f5f5;
}

#3dModel {
 width: 480px;
 height: 270px;
 background-color: #000;
 border: 1px solid #ccc;
 margin: 20px;
}

#uploadButton {
 margin-left: 20px;
 height: 30px;
 width: 100px;
 background-color: #4ecca3;
 color: #fff;
 border: none;
 border-radius: 5px;
}

#inputFile {
 margin-right: 20px;
 height: 30px;
 width: 300px;
 padding: 10px;
 border: none;
 border: 1px solid #ccc;
 border-radius: 5px;
 background-color: #f1f1f1;
}