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

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<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='//cdck-file-uploads-global.s3.dualstack.us-west-2.amazonaws.com/freecodecamp/original/3X/d/c/dc018f5792b17786a4b6e798463b45af8bd282e9.jpg' 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>
              <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>
       <ul>
         <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>
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Do you have a codepen link?

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

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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.

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

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Here, on the upper left:

image

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

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entirely on code pen.

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

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ok, thanks lets me try

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added thanks for the help