Responsive testimonial slider html made with bootstrap and owl carousel is easy to use bootstrap snipp which you can use anywhere in your web page.
Whole html/css code
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap 4 Testimonial Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/assets/owl.carousel.min.css" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/assets/owl.theme.default.min.css"/>
<style>
@import url('https://fonts.googleapis.com/css2?family=Mulish:wght@300;400;500&display=swap');
body {
font-family: 'Mulish', sans-serif;
background: linear-gradient(to top left, #33ccff 0%, #ff99cc 100%);
background-repeat: no-repeat;
background-attachment: fixed;
}
#customers-testimonials .item {
text-align: center;
padding: 20px;
margin-bottom: 50px;
opacity: .2;
-webkit-transform: scale3d(0.8, 0.8, 1);
transform: scale3d(0.8, 0.8, 1);
-webkit-transition: all 0.3s ease-in-out;
-moz-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
}
#customers-testimonials .owl-item.active.center .item {
opacity: 1;
-webkit-transform: scale3d(1.0, 1.0, 1);
transform: scale3d(1.0, 1.0, 1);
}
.owl-carousel .owl-item img {
transform-style: preserve-3d;
max-width: 90px;
margin: 0 auto 17px;
}
#customers-testimonials.owl-carousel .owl-dots .owl-dot.active span, #customers-testimonials.owl-carousel .owl-dots .owl-dot:hover span {
background: #4280bd;
transform: translate3d(0px, -50%, 0px) scale(0.6);
}
#customers-testimonials.owl-carousel .owl-dots {
display: inline-block;
width: 100%;
text-align: center;
}
#customers-testimonials.owl-carousel .owl-dots .owl-dot {
display: inline-block;
outline: none;
}
#customers-testimonials.owl-carousel .owl-dots .owl-dot span {
background: #fff;
display: inline-block;
height: 20px;
margin: 0 2px 5px;
transform: translate3d(0px, -50%, 0px) scale(0.3);
transform-origin: 50% 50% 0;
transition: all 250ms ease-out 0s;
width: 20px;
border-radius: 100%;
}
</style>
</head>
<body>
<!-- TESTIMONIALS -->
<section class="testimonials">
<div class="container">
<div class="row">
<div class="col-sm-12">
<div class="container-fluid px-3 px-sm-5 my-5 text-center">
<h2>What Our Client Say</h2>
</div>
<div id="customers-testimonials" class="owl-carousel">
<!--TESTIMONIAL 1 -->
<div class="item">
<div class="shadow-lg p-4 bg-white rounded">
<img src="https://annedece.sirv.com/Images/pexels-andrea-piacquadio-762020%20(1).jpg" alt="">
<h5 class="pb-2 pt-3">Ximena Vegara</h5>
<p class="mb-0 text-muted">Dramatically maintain clicks-and-mortar solutions without functional solutions. Completely synergize resource taxing relationships via premier niche markets. Professionally cultivate.</p>
</div>
</div>
<!--END OF TESTIMONIAL 1 -->
<!--TESTIMONIAL 2 -->
<div class="item">
<div class="shadow-lg p-4 bg-white rounded">
<img src="https://annedece.sirv.com/Images/pexels-andrea-piacquadio-839011.jpg" alt="">
<h5 class="pb-2 pt-3">Kevin Rich</h5>
<p class="mb-0 text-muted">Dramatically maintain clicks-and-mortar solutions without functional solutions. Completely synergize resource taxing relationships via premier niche markets. Professionally cultivate.</p>
</div>
</div>
<!--END OF TESTIMONIAL 2 -->
<!--TESTIMONIAL 3 -->
<div class="item">
<div class="shadow-lg p-4 bg-white rounded">
<img src="https://annedece.sirv.com/Images/pexels-stefan-stefancik-91227.jpg" alt="">
<h5 class="pb-2 pt-3">James Deo</h5>
<p class="mb-0 text-muted">Dramatically maintain clicks-and-mortar solutions without functional solutions. Completely synergize resource taxing relationships via premier niche markets. Professionally cultivate.</p>
</div>
</div>
<!--END OF TESTIMONIAL 3 -->
<!--TESTIMONIAL 4 -->
<div class="item">
<div class="shadow-lg p-4 bg-white rounded">
<img src="https://annedece.sirv.com/Images/pexels-tim-savage-736716.jpg" alt="">
<h5 class="pb-2 pt-3">Sturt Billy</h5>
<p class="mb-0 text-muted">Dramatically maintain clicks-and-mortar solutions without functional solutions. Completely synergize resource taxing relationships via premier niche markets. Professionally cultivate.</p>
</div>
</div>
<!--END OF TESTIMONIAL 4 -->
</div>
</div>
</div>
</div>
</section>
<!-- END OF TESTIMONIALS -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<script>
jQuery(document).ready(function($) {
"use strict";
// TESTIMONIALS CAROUSEL HOOK
$('#customers-testimonials').owlCarousel({
loop: true,
center: true,
items: 3,
margin: 0,
autoplay: true,
dots:true,
autoplayTimeout: 5000,
smartSpeed: 450,
responsive: {
0: {
items: 1
},
768: {
items: 2
},
1170: {
items: 3
}
}
});
});
</script>
</body>
</html>

