<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
img {
display: block;
margin-left: auto;
margin-right: auto;
}
</style>
</head>
<div class="container">
<div class="row">
<div class="col-lg-4 col-md-4 col-sm-4">
<p>Resize the browser window to see the effect.</p>
<p>The columns will automatically stack on top of each other when the screen is less than 768px wide. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nesciunt dolore esse nobis provident aperiam tempora quas alias aspernatur amet, nostrum, fugiat nam tempore, ratione, earum reiciendis autem molestias illo impedit.
aperiam tempora quas alias aspernatur amet, nostrum, fugiat nam tempore, ratione, earum reiciendis autem molestias illo impedit.</p>
</div>
<div class="col-lg-4 col-md-4 col-sm-4">
<p>To center an image, set left and right margin to auto, and make it into a block element.</p>
<img src="https://via.placeholder.com/150" alt="Paris" style="width:50%;">
<p>To center an image, set left and right margin to auto, and make it into a block element.</p>
</div>
<div class="col-lg-4 col-md-4 col-sm-4">
<p>Resize the browser window to see the effect.</p>
<p>The columns will automatically stack on top of each other when the screen is less than 768px wide. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nesciunt dolore esse nobis provident aperiam tempora quas alias aspernatur amet, nostrum, fugiat nam tempore, ratione, earum reiciendis autem molestias illo impedit.
aperiam tempora quas alias aspernatur amet, nostrum, fugiat nam tempore, ratione, earum reiciendis autem molestias illo impedit.
</p>
</div>
</div>
</div>
</div>
</html>