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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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About Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                 
 <svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
        <symbol viewBox="0 0 43.763 23.214">
            <g id="arrow-left" transform="translate(2.886 2.823)">
                <line id="Line_183" data-name="Line 183" x1="38.495" transform="translate(0.382 8.862)" fill="none"
                    stroke-linecap="round" stroke-miterlimit="10" stroke-width="4" />
                <line id="Line_184" data-name="Line 184" y1="8.205" x2="9.256" transform="translate(0.382 0)"
                    fill="none" stroke-linecap="round" stroke-miterlimit="10" stroke-width="4" />
                <line id="Line_185" data-name="Line 185" x2="10" y2="9" transform="translate(-0.062 8.566)" fill="none"
                    stroke-linecap="round" stroke-miterlimit="10" stroke-width="4" />
            </g>
        </symbol>
        <symbol id="arrow" viewBox="0 0 400.004 400.004" style="enable-background:new 0 0 400.004 400.004;"
            xml:space="preserve">
            <g>
                <path d="M382.688,182.686H59.116l77.209-77.214c6.764-6.76,6.764-17.726,0-24.485c-6.764-6.764-17.73-6.764-24.484,0L5.073,187.757
            c-6.764,6.76-6.764,17.727,0,24.485l106.768,106.775c3.381,3.383,7.812,5.072,12.242,5.072c4.43,0,8.861-1.689,12.242-5.072
            c6.764-6.76,6.764-17.726,0-24.484l-77.209-77.218h323.572c9.562,0,17.316-7.753,17.316-17.315
            C400.004,190.438,392.251,182.686,382.688,182.686z" />
            </g>
        </symbol>
    </svg>

<section class="half-color-box">
        <div class="container spacer por">
            <div class="text-whtie text-center ml-3">
                <h1 class="bold">What Clients Say</h1>
                <p class="lead">
                    Lorem ipsum dolor sit amet consectetur adipisicing elit. Rem, at!
                </p>
            </div>
            <div class="test-arrowbox">

                <div class="swiper-button-prev-test">
                    <svg fill="red" height="34" class="arrow left">
                        <use xlink:href="#arrow" />
                    </svg>
                </div>
                <div class="swiper-button-next-test">
                    <div class="arrow-right">
                        <svg fill="red" height="60" width="60" class="arrow">
                            <use xlink:href="#arrow" />
                        </svg>
                    </div>

                </div>
            </div>
            <div class="swiper-container swiper-testimonial">
                <div class="swiper-wrapper">
                    <div class="swiper-slide">
                        <div class="review-box">
                            <div class="media">
                                <img class="mr-3" src="https://picsum.photos/50/50" alt="Generic placeholder image">
                                <div class="media-body">
                                    <h5>Amanda Jackson</h5>
                                    <p class="user-post">CEO, NRD Group</p>
                                </div>
                            </div>
                            <p class="read">
                                It has survived not only five centuries, but also the leap into electronic typesetting,
                                remaining essentially unchanged. It was popularised in the 1960s with the race.
                            </p>
                            <img class="quote" src="img/icons/quote.svg" alt="">

                        </div>
                    </div>
                    <div class="swiper-slide">
                        <div class="review-box">
                            <div class="media">
                                <img class="mr-3" src="https://picsum.photos/50/50/" alt="Generic placeholder image">
                                <div class="media-body">
                                    <h5>Amanda Jackson</h5>
                                    <p class="user-post">CEO, NRD Group</p>
                                </div>
                            </div>
                            <p class="read">
                                It has survived not only five centuries, but also the leap into electronic typesetting,
                                remaining essentially unchanged. It was popularised in the 1960s with the race.
                            </p>
                            <img class="quote" src="img/icons/quote.svg" alt="">
                        </div>
                    </div>
                    <div class="swiper-slide">
                        <div class="review-box">
                            <div class="media">
                                <img class="mr-3" src="https://picsum.photos/50/50" alt="Generic placeholder image">
                                <div class="media-body">
                                    <h5>Amanda Jackson</h5>
                                    <p class="user-post">CEO, NRD Group</p>
                                </div>
                            </div>
                            <p class="read">
                                It has survived not only five centuries, but also the leap into electronic typesetting,
                                remaining essentially unchanged. It was popularised in the 1960s with the race.
                            </p>
                            <img class="quote" src="img/icons/quote.svg" alt="">

                        </div>
                    </div>
                    <div class="swiper-slide">
                        <div class="review-box">
                            <div class="media">
                                <img class="mr-3" src="img/icons/user.png" alt="Generic placeholder image">
                                <div class="media-body">
                                    <h5>Amanda Jackson</h5>
                                    <p class="user-post">CEO, NRD Group</p>
                                </div>
                            </div>
                            <p class="read">
                                It has survived not only five centuries, but also the leap into electronic typesetting,
                                remaining essentially unchanged. It was popularised in the 1960s with the race.
                            </p>
                            <img class="quote" src="img/icons/quote.svg" alt="">
                        </div>
                    </div>
                </div>
                <!-- Add Pagination -->
                <div class="swiper-pagination"></div>

            </div>
        </div>
    </section>
!

CSS 

              
                :root {
  --theme-color: #3950ca;
  --bg-color: rgba(79, 48, 183, 0.06);
  --comp-color: #ff6584;
  --gradient: linear-gradient(#6a5fdd 0%, #241d8c 100%);
}
@import url('https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700,900&display=swap');
body {
     font-family: 'Poppins', sans-serif;
  margin:0;
  pading:0
}
.text-center {
  text-align:center;
  
}
h2,h1 {
  margin:0;
  padding-top:30px;
}

.bg-color {
  background: var(--bg-color);
}

.half-color-box {
  background: var(--gradient);
  height: 300px;
  margin-bottom: 100px;
}

.text-whtie {
  color: #fff !important;
}

.bold {
  font-weight: bolder;
}

.por {
  position: relative;
}

.review-box .quote {
  position: absolute;
  width: 40px;
  right: 10px;
  bottom: 10px;
}

.test-arrowbox {
  position: absolute;
  right: 20px;
  display: flex;
  top: 70px;
}

.review-box {
  border-radius: 3px;
  background: #fff;
  box-shadow: 0px 3px 20px rgba(0, 0, 0, 0.1);
  padding: 30px;
}

.review-box h5 {
  margin: 0;
}

.review-box p {
  margin-bottom: 0;
  margin-top: 10px;
  color: #7d8597;
}

.user-post {
  font-size: 14px;
  margin: 0 !important;
 
}

.swiper-testimonial {
  padding: 100px 20px;
  padding-top: 30px;
}

.half-color-box {
  background: var(--gradient);
  height: 300px;
  margin-bottom: 140px;
}

.test-arrowbox .swiper-button-next-test,
.test-arrowbox .swiper-button-prev-test {
  margin-right: 20px;
  /* background: var(--comp-color);2 */
  border-radius: 50%;
  --size: 55px;
  width: var(--size);
  height: var(--size);
  display: flex;
  align-items: center;
  justify-content: center;
}

.arrow-right {
  transform: rotate(180deg);
  margin-top: -8px;
}

.arrow {
  cursor: pointer;
  transition: all 0.2s ease-in;
}

.arrow:hover {
  transform: translateX(-15px);
}
!

JS 

              
                var swiper = new Swiper('.swiper-container.swiper-testimonial', {
    slidesPerView: 3,
    spaceBetween: 30,
    pagination: {
        el: '.swiper-pagination',
        clickable: true,
    },
    navigation: {
        nextEl: '.swiper-button-next-test',
        prevEl: '.swiper-button-prev-test',
    },
});
!
999px

Console