<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,400,700">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-xl">
<div class="row">
<div class="col-md-9 mx-auto">
<h2><span>Thumbnail <b>Carousel</b></span></h2>
<div id="myCarousel" class="carousel slide" data-ride="carousel" data-interval="0">
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<div class="row">
<div class="col-sm-4"><div class="img-box"><img src="https://images.pexels.com/photos/1408221/pexels-photo-1408221.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940" class="img-fluid" alt=""></div></div>
<div class="col-sm-4"><div class="img-box"><img src="https://images.pexels.com/photos/1083822/pexels-photo-1083822.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940" class="img-fluid" alt=""></div></div>
<div class="col-sm-4"><div class="img-box"><img src="https://images.pexels.com/photos/1083822/pexels-photo-1083822.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940" class="img-fluid" alt=""></div></div>