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HTML 

              
                <!DOCTYPE html>
<html>

    <head>

        <title>Bootstrap 3 Carousel different height using img object-fit: cover</title>

        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />

        <!-- bootstrap 3 css -->
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css" />


<!-- carousel -->
        <style>

            .carousel {
                height: 400px;
            }

            .carousel-inner {
                height: 100%;
            }

            .item {
                width: 100%;
                height: 100%;
            }

            .item img {
                object-fit: cover;
/*
                object-fit: fill;
                object-fit: none;
                object-fit: contain;
                object-fit: scale-down;
*/
            }

        </style>
<!-- carousel || -->


    </head>

    <body>

        <div class="container">

            <h2>Bootstrap 3 Carousel different height using img object-fit: cover</h2>

            <div id="myCarousel" class="carousel slide" data-ride="carousel">

                <!-- Indicators -->
                <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>

                <!-- Wrapper for slides -->
                <div class="carousel-inner">

                    <div class="item active" >
                        <img src="http://i68.tinypic.com/rgyq03.jpg" alt="Los Angeles" style="width: 100%; height: 100%" />
                        <div class="carousel-caption">
                            <h3>Los Angeles</h3>
                            <p>LA is always so much fun!</p>
                        </div>
                    </div>

                    <div class="item" >
                        <img src="http://i65.tinypic.com/33ehcgw.jpg" alt="Chicago" style="width: 100%; height: 100%" />
                        <div class="carousel-caption">
                            <h3>Chicago</h3>
                            <p>Thank you, Chicago!</p>
                        </div>
                    </div>

                    <div class="item">
                        <img src="http://i64.tinypic.com/qn3gg5.jpg" alt="New York" style="width: 100%; height: 100%" />
                        <div class="carousel-caption">
                            <h3>New York</h3>
                            <p>We love the Big Apple!</p>
                        </div>
                    </div>

                </div>

                <!-- Left and right controls -->
                <a class="left carousel-control" href="#myCarousel" data-slide="prev">
                    <span class="glyphicon glyphicon-chevron-left"></span>
                    <span class="sr-only">Previous</span>
                </a>
                <a class="right carousel-control" href="#myCarousel" data-slide="next">
                    <span class="glyphicon glyphicon-chevron-right"></span>
                    <span class="sr-only">Next</span>
                </a>

            </div>

        </div>


        <!-- jquery 3 -->
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

        <!-- bootstrap 3 js -->
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>


    </body>

</html>
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