jquery - I can't create a big box that is grey on my website with bootstrap's "well" command -


this code on codepens html sheet :

<body>   <div class="well">       <h1 class="text-primary container-fluid well"> school - "htl donaustadt" </h1>   </div>   <img src="https://pbs.twimg.com/profile_images/2207244694/logo_cmyk_300dpi_400x400.jpg" </body>

you can see inserted word "well" bootstrap 2 times , both didnt worked . first tryed out divison parent ( didn't worked ) used class in h1 ( didn't worked ) . goal center grey box can put images , text in . i'm newbie sorry bad , easy questions. , understand - "container" need understand here complete easy task ?

i hope need. in code provided there no closing brace ">" image. problem might have faced because might not have included source file bootstrap. 

<!doctype html>     <html lang="en">     <head>       <title>bootstrap example</title>       <meta charset="utf-8">       <meta name="viewport" content="width=device-width, initial-scale=1">       <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">       <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>       <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>     </head>     <body>      <div class="well">           <h1 class="text-primary container-fluid well"> school - "htl donaustadt" </h1>       </div>     <img src="https://pbs.twimg.com/profile_images/2207244694/logo_cmyk_300dpi_400x400.jpg">      </body>     </html>

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