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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

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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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HTML 

              
                <div class="generic"></div>
    <div class="mbg bg bgimg"></div>
    <div class="ibg bg bgimg"></div>
    <div class="gbg bg bgimg"></div>
    <div class="backgrounds" onclick="noSpin()"></div>
    <div class="card-wrap center">
        <div onclick="spin(this)" class="card card-1">
            <div class="inner">
                <div class="front">
                    <h1>THE MARTIAN</h1>
                    <img src="https://connorlaw.co.uk/images/Martian-front.png" alt="Martian">
                </div>
                <div class="back">
                   <div class="back-info center">
                    <H2 class="m">THE MARTIAN</H2>
                    <p class="blurb">When astronauts blast off from the planet Mars, they leave behind Mark Watney (Matt Damon), presumed dead after a fierce storm. With only a meager amount of supplies, the stranded visitor must utilize his wits and spirit to find a way to survive on the hostile planet.<br><br>Meanwhile, back on Earth, members of NASA and a team of international scientists work tirelessly to bring him home, while his crew mates hatch their own plan for a daring rescue mission.</p>
                    </div>
                    <div class="back-buttons">
                           <h4>Play Now</h4>
                           <h4>Download</h4>
                           <h4>Add To List</h4>
                       </div>
                    <img src="https://connorlaw.co.uk/images/Martian-Back.png" alt="Martian">
                </div>
            </div>
        </div><div onclick="spin(this)" class="card card-2">
            <div class="inner">
                <div class="front">
                    <h1>INTERSTELLAR</h1>
                    <img src="https://connorlaw.co.uk/images/Interstellar-front.png" alt="Interstellar">
                </div>
                <div class="back">
                   <div class="back-info center">
                    <H2 class="i">INTERSTELLAR</H2>
                       <p class="blurb ">In Earth's future, a global crop blight and second Dust Bowl are slowly rendering the planet uninhabitable. Professor Brand (Michael Caine), a brilliant NASA physicist, is working on plans to save mankind by transporting Earth's population to a new home via a wormhole.<br><br>But first, Brand must send former NASA pilot Cooper (Matthew McConaughey) and a team of researchers through the wormhole and across the galaxy to find out which of three planets could be mankind's new home.</p></div>
                       <div class="back-buttons">
                           <h4>Play Now</h4>
                           <h4>Download</h4>
                           <h4>Add To List</h4>
                       </div>
                    <img src="https://connorlaw.co.uk/images/Interstellar-Back.png" alt="Martian">
                </div>
            </div>
        </div><div onclick="spin(this)" class="card">
            <div class="inner">
                <div class="front">
                    <h1>GRAVITY</h1>
                    <img src="https://connorlaw.co.uk/images/Gravity-front.png" alt="Gravity">
                </div>
                <div class="back">
                  <div class="back-info center">
                   <H2 class="g">GRAVITY</H2>
                      <p class="blurb ">Dr. Ryan Stone (Sandra Bullock) is a medical engineer on her first shuttle mission. Her commander is veteran astronaut Matt Kowalsky (George Clooney), helming his last flight before retirement.<br><br>Then, during a routine space walk by the pair, disaster strikes: The shuttle is destroyed, leaving Ryan and Matt stranded in deep space with no link to Earth and no hope of rescue. As fear turns to panic, they realize that the only way home may be to venture further into space.</p></div>
                      <div class="back-buttons">
                           <h4>Play Now</h4>
                           <h4>Download</h4>
                           <h4>Add To List</h4>
                       </div>
                    <img src="https://connorlaw.co.uk/images/Gravity-Back.png" alt="Martian">
                </div>
            </div>
        </div>
    </div>
!

CSS 

              
                * {
    margin: 0 auto;
}

body {
    height: 100vh;
    background-image: url(https://connorlaw.co.uk/images/earth.jpg);
  background-repeat: no-repeat;
}

.center {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}

.bg {
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

.bgimg {
    opacity: 0;
    transition: 0.6s;
}

h1 {
    font-family: 'Big Shoulders Text', cursive;
    position: absolute;
    width: 100%;
    top: 83%;
    opacity: 0.4;
    right: 15px;
    text-align: right;
    letter-spacing: 1px;
}

.blurb {
    font-family: 'Lato', sans-serif;
    letter-spacing: 0.15px;
    width: 300px;
    height: fit-content;
    text-align: center;
    padding: 0rem 1rem;
    box-sizing: border-box;
    font-weight: 300;
    font-size: 14px;
    bottom: 50px;
}

.back h2 {
    width: 300px;
    top: 30px;
    letter-spacing: 4px;
    text-align: center;
    font-size: 30px;
    margin-bottom: 50px;
}

.back-info {
    height: fit-content;
}

.back-buttons {
    font-family: 'Lato', sans-serif;
    letter-spacing: 0.15px;
    font-size: 10px;
    position: absolute;
    left: 45px;
    bottom: -6px;
}

h4 {
    margin-bottom: 23px
}

.m {
    font-family: 'Work Sans', sans-serif;
}

.i {
    font-family: 'Arapey', serif;
}

.g {
    font-family: 'Poppins', sans-serif;
}

.backgrounds {
    height: 100vh;
    width: 100vw;
    background-color: white;
    opacity: 0;
    position: absolute;
}

.mbg {
    background-image: url(https://connorlaw.co.uk/images/martian-bg.png);
    position: absolute;
}

.ibg {
    background-image: url(https://connorlaw.co.uk/images/interstellar-bg.png);
    position: absolute;
}

.gbg {
    background-image: url(https://connorlaw.co.uk/images/gravity-bg.jpg);
    position: absolute;
}

.card-wrap {
    width: fit-content;
    height: 80vh;
}

.card {
    width: 300px;
    height: 80vh;
    perspective: 1000px;
    position: relative;
    display: inline-block;
    margin: 0 5vh;
    transition: 0.6s;
    cursor: pointer;
}

.card:hover {
    transform: scale(1.05);
}

.inner {
    position: absolute;
    width: 100%;
    height: 100%;
    transition: transform 1.4s;
    transform-style: preserve-3d;
}

.spin .inner {
    transform: rotateY(-180deg) scale(1.1);
}

.front, .back {
    position: absolute;
    backface-visibility: hidden;
    width: 300px;
    height: 600px;
    color: #fff;
}

img {
    width: 100%;
    height: 100%;
    border-radius: 20px;
}

.back {
    transform: rotateY(-180deg);
}
!

JS 

              
                let bgs = document.getElementsByClassName("bgimg");
function spin(card) {
    noSpin();
    card.classList.add("spin");
    if (card.classList.contains("card-1")) {
        bgs[0].style.opacity = 1;
    } else if (card.classList.contains("card-2")) {
        bgs[1].style.opacity = 1;
    } else if (card.classList.contains("card-3")) {
        bgs[2].style.opacity = 1;
    };
};

function noSpin() {
    let cards = document.getElementsByClassName("card");
    for (let i = 0; i < cards.length; i++) {
        cards[i].classList.remove("spin");
    };
    for (let i = 0; i < bgs.length; i++) {
        bgs[i].style.opacity = 0;
    };
};
!
999px

Console