Thumbnail

                        
<section id="dt-content" class="sec-pt-lg">
    <div class="container">
        <div class="row">
            <div class="col-12 col-md-4 text-center">
                <h2>Thumbnail</h2>
                <img src="themes/custom/education_pro/assets/theme/img/gallery/image-dummy-square.jpg" alt="" class="img-fluid img-thumbnail">
             </div>
            </div>
     </div>
</section>

Rounded

                        
<section id="dt-content" class="sec-pt-lg">
    <div class="container">
        <div class="row">
            <div class="col-12 col-md-4 text-center">
                <h2>Rounded</h2>
                <img src="themes/custom/education_pro/assets/theme/img/gallery/image-dummy-square.jpg" alt="" class="img-fluid rounded">
             </div>
        </div>
     </div>
</section>

Circle

                        
<section id="dt-content" class="sec-pt-lg">
    <div class="container">
        <div class="row">
            <div class="col-12 col-md-4 text-center">
                <h2>Circle</h2>
                <img src="themes/custom/education_pro/assets/theme/img/gallery/image-dummy-square.jpg" alt="" class="img-fluid rounded-circle">
            </div>
        </div>
    </div>
</section>