Building the frontend

Let's begin with the HTML of the app. Put this code in the index.html file, as follows:

<!DOCTYPE html> <html lang="en">     <head>         <meta name="viewport" content="width=device-width, initial-          scale=1, shrink-to-fit=no">         <link rel="stylesheet" href="/css/bootstrap.min.css">     </head>     <body>         <div class="container">             <div class="row">                 <div class="col-md-6 offset-md-3 text-xs-center">                     <br>                     <h3>Upload any file</h3>                     <br>                     <div>                         <div class="form-group">                             <label class="custom-file text-xs-left">                                 <input type="file" id="file"                                   class="custom-file-input">                                 <span class="custom-file-control">                                </span>                             </label>                         </div>                         <div class="form-group">                             <label for="owner">Enter owner name</label>  <input type="text" class="form-control" ...

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