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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

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

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

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

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Babel includes JSX processing.

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
  </head>
<body class="">
    <main class="vw-100 vh-100 d-flex flex-row justify-content-center align-items-center">
    <div class="logos overflow-hidden position-relative d-flex">
        <div class="logos-slide d-flex" style="white-space:nowrap;">
            <section class="card c1 text-bg-warning py-2 px-2 rounded-3 d-flex justify-content-center align-items-center flex-column" >
                    <p class="text" role="paragraph" aria-label="testimonial">
                        Awesome job you did there <em>@lambdatesting</em> with the LT Browser. It's doing a fantastic job at responsive testing 🔥 see more >
                    </p>
                    <div class="d-flex mt-5">
                        <span class="s1">
                            <img src="https://user-images.githubusercontent.com/78242022/272654602-6b6c4303-587d-48ae-957a-3b88496f1fcc.png" alt="">
                        </span>
                        <span class="s2">
                            <h4 role="heading" aria-label="4">Mbaziira Ronald</h4>
                            <p class="at">@MbaziiraRonn</p>
                        </span>
                    </div>
                </section>
    
                <!-- Card Two -->
                <section class="card c1 text-bg-warning py-2 px-2  rounded-3 d-flex justify-content-center align-items-center flex-column">
                    <p class="text" role="paragraph" aria-label="testimonial">Amazing Test software. I am very satisfied, I think it is excellent software and as the years go by it continues to offer the best service I have ever tried....see more ></p>
                    <div class="d-flex mt-5">
                        <span class="s1">
                            <img src="https://user-images.githubusercontent.com/78242022/272654585-d0774fd3-5d90-42f0-bc53-7141f7735825.png" alt="">
                        </span>
                        <span class="s2">
                            <h4 role="heading" aria-label="4">Elias M.</h4>
                        </span>
                    </div>
                </section>
    
                <!-- Card Three -->
                <section class="card c1 text-bg-warning py-2 px-2  rounded-3 d-flex justify-content-center align-items-center flex-column">
                    <p class="text" role="paragraph" aria-label="testimonial">Anyone who needs to test their code on different platforms try <em>@lambdatesting</em> Great service from this company!</p>
                    <div class="d-flex mt-5">
                        <span class="s1">
                            <img src="https://user-images.githubusercontent.com/78242022/266013776-40ac50f1-31f8-4250-acb2-05f16d683baa.png" alt="">
                        </span>
                        <span class="s2">
                            <h4 role="heading" aria-label="4">Stephan Smuts</h4>
                            <p class="at">spsmuts</p>
                        </span>
                    </div>
                </section>
    
                <!-- Card Four -->
                <section class="card c1 text-bg-warning py-2 px-2  rounded-3 d-flex justify-content-center align-items-center flex-column">
                    <p class="text" role="paragraph" aria-label="testimonial">See how  <em>@lambdatesting</em> is #Futureready to enable blazing-fast test orchestration seamlessly integrated with organizations' existing CI/CD platforms, using #Microsoft Azure.</p>
                    <div class="d-flex mt-5">
                        <span class="s1">
                            <img src="https://user-images.githubusercontent.com/78242022/272654608-d291d9df-439c-4a79-83b1-2f2d71cd25b5.png" alt="">
                        </span>
                        <span class="s2">
                            <h4 role="heading" aria-label="4">Microsoft India</h4>
                            <p class="at">@MicrosoftIndia</p>
                        </span>
                    </div>
                </section>
    
                <!-- Card Five -->
                <section class="card c1 text-bg-warning py-2 px-2  rounded-3 d-flex justify-content-center align-items-center flex-column">
                    <p class="text" role="paragraph" aria-label="testimonial">Amazing Experience. That reduces a large amount of cost as well as manhours which can be used for other better things. In our team we have integrated lambdatest with our automation CI/CD pipeline, this shows how we trust <em>@lambdatesting</em>...see more >.</p>
                    <div class="d-flex mt-5">
                        <span class="s1">
                            <img src="https://user-images.githubusercontent.com/78242022/272654585-d0774fd3-5d90-42f0-bc53-7141f7735825.png" alt="">
                        </span>
                        <span class="s2">
                            <h4 role="heading" aria-label="4">Padma kumar M.</h4>
                        </span>
                    </div>
                </section>
    
                 <!-- Card Six -->
                <section class="card c1 text-bg-warning py-2 px-2  rounded-3 d-flex justify-content-center align-items-center flex-column">
                    <p class="text" role="paragraph" aria-label="testimonial"><em>@lambdatesting</em> Efficient and User-Friendly Cross-Browser Testing with LambdaTest...see more ></p>
                    <div class="d-flex mt-5">
                        <span class="s1">
                            <img src="https://user-images.githubusercontent.com/78242022/266013732-785b0223-9774-4918-964f-ce75f11138f2.png" alt="">
                        </span>
                        <span class="s2">
                            <h4 role="heading" aria-label="4">Ravi Kanth G.</h4>
                        </span>
                    </div>
                </section>
        </div>
    </div>
  </main>
    <script src="" integrity="sha384-I7E8VVD/ismYTF4hNIPjVp/Zjvgyol6VFvRkX/vR+Vc4jQkC+hVqc2pM8ODewa9r" crossorigin="anonymous"></script>
<script src="" integrity="sha384-BBtl+eGJRgqQAUMxJ7pMwbEyER4l1g+O15P+16Ep7Q9Q+zqX6gSbd85u4mG4QzX+" crossorigin="anonymous"></script>

<script>
 
</script>
  </body>
</html>
!

CSS 

              
                  * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        .logos-slide {
            white-space: nowrap;
            animation: 20s slide infinite linear;
        }

        .logos:hover .logos-slide {
            animation-play-state: paused;
        }

        .logos-slide img {
            height: 60px;
            margin: 0 50px;
        }

        .card {
            white-space: wrap;
            min-width: 400px;
            margin: 0 10px;
        }

        @keyframes slide {
            from{
                transform: translateX(0);
            }

            to {
                transform: translateX(-100%);
            }
        }
!

JS 

              
                 const cloneEl = document.querySelector(".logos-slide").cloneNode(true)
  document.querySelector('.logos').appendChild(cloneEl);
!
999px

Console