Can't create container using bootstrap, and text-center refused to activate, my code below

<div class="container">
    <div class="jumbotron">
       <div class="row">
         <div class="col-xs-12">
           <h1 class="text-center">PRESIDENT MUHAMMADU BUHARI</h1>
            <h2 class="text-center"><em>The man who rescued the country from being disintegration and corruption</em></h2>
              <div class="thumbnail"><img src='//' alt="A photo of PMB" >
  <div class="caption text-center">Meet President Muhammadu Buhari, the Boko harram crusader, curruption fighter and a nation builder</div>
              <div class="col-xs-12 col-sm-10 col-sm-offset-1 col-md-8 col-md-offset-2">      
     <h3>Here's the President Muhammadu Buhari's timeline:</h3>
         <li><b>Early life-</b> Muhammadu Buhari was born to a Fulani family on 17 December 1942, in Daura, Katsina State, to his father Adamu and mother Zulaihat. He is the twenty-third child of his father. Buhari was raised by his mother, after his father died when he was about four years old.<br>He attended primary school in Daura and Mai'adua before proceeding to Katsina Model School in 1953, and to Katsina Provincial Secondary School (now Government College Katsina) from 1956 to 1961.</li>

Do you have a codepen link?

I am writing the code now; let me get the link

Have you tried quick-adding Bootstrap 3? You can do so by clicking the little cog icon on the CSS editor, then scroll down and select Bootstrap 3 from the dropdown at the bottom.

I didn’t see any tittle cog icon on the code editor

Here, on the upper left:


Just to be clear, are you making the project entirely on codepen, or are you making it locally?

entirely on code pen.

Then you can click that icon and add Bootstrap from there.

ok, thanks lets me try

added thanks for the help