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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>

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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

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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <header>
  <h1>SITE TITLE</h1>
  <nav>
    <ul>
      <li><a href="#">HOME</a></li>
      <li><a href="#">ABOUT</a></li>
      <li><a href="#">SERVICES</a></li>
      <li><a href="#">CONTACT</a></li>
    </ul>
  </nav>
</header>
<section class="main-slider">
  <div class="item image">
    <span class="loading">Loading...</span>
    <figure>
      <div class="slide-image slide-media" style="background-image:url('https://images.unsplash.com/photo-1617339847756-976edbc411e7?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0MzA4MTE4Mg&ixlib=rb-1.2.1&q=85');">
        <img data-lazy="https://images.unsplash.com/photo-1617339847756-976edbc411e7?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0MzA4MTE4Mg&ixlib=rb-1.2.1&q=85" class="image-entity" />
      </div>
      <figcaption class="caption">Static Image</figcaption>
    </figure>
  </div>
  <div class="item vimeo" data-video-start="4">
    <iframe class="embed-player slide-media" src="https://player.vimeo.com/video/78430027?api=1&byline=0&portrait=0&title=0&background=1&mute=1&loop=1&autoplay=0&id=78430027" width="980" height="520" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
    <p class="caption">Vimeo</p>
  </div>
  <div class="item image">
    <figure>
      <div class="slide-image slide-media" style="background-image:url('https://images.unsplash.com/photo-1485178575877-1a13bf489dfe?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0MzA4MTIwOQ&ixlib=rb-1.2.1&q=85');">
        <img data-lazy="https://images.unsplash.com/photo-1485178575877-1a13bf489dfe?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0MzA4MTIwOQ&ixlib=rb-1.2.1&q=85" class="image-entity" />
      </div>
      <figcaption class="caption">Static Image</figcaption>
    </figure>
  </div>
  <div class="item youtube">
    <iframe class="embed-player slide-media" width="980" height="520" src="https://www.youtube.com/embed/QV5EXOFcdrQ?enablejsapi=1&controls=0&fs=0&iv_load_policy=3&rel=0&showinfo=0&loop=1&playlist=QV5EXOFcdrQ&start=1" frameborder="0" allowfullscreen></iframe> 
    <p class="caption">YouTube</p>
  </div>
  <div class="item image">
    <figure>
      <div class="slide-image slide-media" style="background-image:url('https://images.unsplash.com/photo-1483555714914-20a74b6e45f5?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0MzA4MTIwOQ&ixlib=rb-1.2.1&q=85');">
        <img data-lazy="https://drive.google.com/uc?export=view&id=0B_koKn2rKOkLSlBkWDBsWXJNazQ" class="image-entity" />
      </div>
      <figcaption class="caption">Static Image</figcaption>
    </figure>
  </div>
  <div class="item video">
    <video class="slide-video slide-media" loop muted preload="metadata" poster="https://images.unsplash.com/photo-1483555714914-20a74b6e45f5?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0MzA4MTIwOQ&ixlib=rb-1.2.1&q=85">
      <source src="https://player.vimeo.com/external/138504815.sd.mp4?s=8a71ff38f08ec81efe50d35915afd426765a7526&profile_id=112" type="video/mp4" />
    </video>
    <p class="caption">HTML 5 Video</p>
  </div>
</section>
<section class="container">
  <div class="content">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Suscipit veniam quisquam, rem illum dicta cumque, voluptate fugiat impedit beatae rerum ratione, voluptates nisi magni delectus ab, eaque atque iste. Molestias incidunt nemo veniam alias nam nisi distinctio optio error architecto odit! Illo dicta nulla fugiat distinctio laudantium, corrupti eum unde.</p>

    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Suscipit veniam quisquam, rem illum dicta cumque, voluptate fugiat impedit beatae rerum ratione, voluptates nisi magni delectus ab, eaque atque iste. Molestias incidunt nemo veniam alias nam nisi distinctio optio error architecto odit! Illo dicta nulla fugiat distinctio laudantium, corrupti eum unde. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Suscipit veniam quisquam, rem illum dicta cumque, voluptate fugiat impedit beatae rerum ratione, voluptates nisi magni delectus ab, eaque atque iste. Molestias incidunt nemo veniam alias nam nisi distinctio optio error architecto odit! Illo dicta nulla fugiat distinctio laudantium, corrupti eum unde.</p>
  </div>
</section>
!

CSS 

              
                $fonts: Arial, "Hiragino Kaku Gothic Pro W3", Meiryo, sans-serif;
$bg_color: #2d3042;
$font_color: #efefef;
$link_color: #efefef;
$link_hover_color: #fff;

*, *:before, *:after {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
body {
  font-family: $fonts;
  background-color: $bg_color;
  position: relative;
  color: $font_color;
  text-align: center;
  a, a:visited {
    color: $link_color;
    text-decoration: none;
  }
  a:hover {
    color: $link_hover_color;
  }
}
%bv_hidden {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
%filled_obj {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 60px;
  padding: 0 5%;
  text-align: left;
  z-index: 1;
  h1 {
    display: inline-block;
    font-size: 22px;
    font-weight: bold;
    padding-top: 18px;
  }
  nav {
    display: inline-block;
    float: right;
    ul {
      li {
        display: inline-block;
        vertical-align: top;
        font-size: 13px;
        a {
          display: block;
          padding: 24px 15px;
          &:hover {
            background-color: rgba(#fff, .18);
          }
        }
      }
    }
  }
}

.main-slider {
  position: relative;
  width: 100%;
  height: 38vw;
  min-height: 8vw;
  margin-bottom: 50px;
  opacity: 0;
  visibility: hidden;
  transition:all 1.2s ease;
  &.slick-initialized {
    opacity: 1;
    visibility: visible;
  }
}
.slick-slide {
  position: relative;
  height: 38vw;
  @extend %bv_hidden;
  &::before {
    @extend %filled_obj;
    @extend %bv_hidden;
    background-color: #000;
    opacity: .3;
    z-index: 1;
  }
  video {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform:translate(-50%, -50%);
  }
  iframe {
    position: relative;
    pointer-events: none;
  }
  figure {
    position: relative;
    height: 100%;
  }
  .slide-image {
    opacity: 0;
    height: 100%;
    background-size: cover;
    background-position: center;
    // background-color:rgba(#c46897,.38);
    // background-blend-mode:overlay;
    transition:all .8s ease;
    &.show {
      opacity: 1;
    }
  }
  .image-entity {
    width: 100%;
    opacity: 0;
    visibility: hidden;
  }
  .loading {
    position: absolute;
    top: 44%;
    left: 0;
    width: 100%;
  }
  .slide-media {
    animation:slideOut .4s cubic-bezier(0.4, 0.29, 0.01, 1);
  }
  &.slick-active {
    z-index: 1;
    .slide-media {
      animation:slideIn 2.4s cubic-bezier(0.4, 0.29, 0.01, 1);
    }
    .caption {
      opacity: 1;
      transform:translateY(0);
      transition:all .7s cubic-bezier(0.32, 0.34, 0, 1.62) .6s;
    }
  }
}
.caption {
  position: absolute;
  top: 44%;
  left: 5%;
  text-align: center;
  padding: 20px;
  border: 3px solid;
  color: #fff;
  margin: 0;
  font-size: 40px;
  font-weight: bold;
  letter-spacing: .02em;
  opacity: 0;
  z-index: 1;
  transition:all .3s ease;
  transform:translateY(100px);
  @extend %bv_hidden;
}

.slick-dots {
  text-align: center;
  padding-top: 15px;
  li {
    display: inline-block;
    vertical-align: top;
    margin: 0 8px;
    button {
      width: 16px;
      height: 16px;
      border: none;
      cursor: pointer;
      border-radius: 50%;
      border: 2px solid #fff;
      box-shadow: 0 0 0 0 transparent;
      vertical-align: middle;
      color: #fff;
      background-color: #fff;
      transition:all .3s ease;
      opacity: .4;
      &:focus {
        outline: none;
      }
      &:hover {
        opacity: 1;
      }
    }
    &.slick-active {
      button {
        border-color: $bg_color;
        box-shadow: 0 0 0 2px #fff;
        opacity: 1;
      }
    }
  }
}

.container {
  background-color: #f2f2f2;
  color: #444;
  line-height: 1.6;
  padding: 40px 0;
  .content {
    width: 90%;
    max-width: 980px;
    margin: 0 auto;
  }
  p {
    margin-bottom: 40px;
  }
}

@keyframes slideIn {
  from {
    filter:blur(15px);
  }
  to {
    filter:blur(0);
  }
}
@keyframes slideOut {
  from {
    filter:blur(0);
  }
  to {
    filter:blur(15px);
  }
}
!

JS 

              
                const slideWrapper = $(".main-slider"),
    iframes = slideWrapper.find('.embed-player'),
    lazyImages = slideWrapper.find('.slide-image');
let lazyCounter = 0;

// POST commands to YouTube or Vimeo API
const postMessageToPlayer = (player, command) =>{
  if (player == null || command == null) return;
  player.contentWindow.postMessage(JSON.stringify(command), "*");
}

// When the slide is changing
const playPauseVideo = (slick, control) => {
  let currentSlide, slideType, startTime, player, video;

  currentSlide = slick.find(".slick-current");
  slideType = currentSlide.attr("class").split(" ")[1];
  player = currentSlide.find("iframe").get(0);
  startTime = currentSlide.data("video-start");

  if (slideType === "vimeo") {
    switch (control) {
      case "play":
        if ((startTime != null && startTime > 0 ) && !currentSlide.hasClass('started')) {
          currentSlide.addClass('started');
          postMessageToPlayer(player, {
            "method": "setCurrentTime",
            "value" : startTime
          });
        }
        postMessageToPlayer(player, {
          "method": "play",
          "value" : 1
        });
        break;
      case "pause":
        postMessageToPlayer(player, {
          "method": "pause",
          "value": 1
        });
        break;
    }
  } else if (slideType === "youtube") {
    switch (control) {
      case "play":
        postMessageToPlayer(player, {
          "event": "command",
          "func": "mute"
        });
        postMessageToPlayer(player, {
          "event": "command",
          "func": "playVideo"
        });
        break;
      case "pause":
        postMessageToPlayer(player, {
          "event": "command",
          "func": "pauseVideo"
        });
        break;
    }
  } else if (slideType === "video") {
    video = currentSlide.children("video").get(0);
    if (video != null) {
      if (control === "play"){
        video.play();
      } else {
        video.pause();
      }
    }
  }
}

// Resize player
const resizePlayer = (iframes, ratio) => {
  if (!iframes[0]) return;
  var win = $(".main-slider"),
      width = win.width(),
      playerWidth,
      height = win.height(),
      playerHeight,
      ratio = ratio || 16/9;

  iframes.each(function(){
    let current = $(this);
    if (width / ratio < height) {
      playerWidth = Math.ceil(height * ratio);
      current.width(playerWidth).height(height).css({
        left: (width - playerWidth) / 2,
         top: 0
        });
    } else {
      playerHeight = Math.ceil(width / ratio);
      current.width(width).height(playerHeight).css({
        left: 0,
        top: (height - playerHeight) / 2
      });
    }
  });
}

// DOM Ready
$(function() {
  // Initialize
  slideWrapper.on("init", function(slick){
    slick = $(slick.currentTarget);
    setTimeout(function(){
      playPauseVideo(slick,"play");
    }, 1000);
    resizePlayer(iframes, 16/9);
  });
  slideWrapper.on("beforeChange", function(event, slick) {
    slick = $(slick.$slider);
    playPauseVideo(slick,"pause");
  });
  slideWrapper.on("afterChange", function(event, slick) {
    slick = $(slick.$slider);
    playPauseVideo(slick,"play");
  });
  slideWrapper.on("lazyLoaded", function(event, slick, image, imageSource) {
    lazyCounter++;
    if (lazyCounter === lazyImages.length){
      lazyImages.addClass('show');
      // slideWrapper.slick("slickPlay");
    }
  });

  //start the slider
  slideWrapper.slick({
    // fade:true,
    autoplaySpeed:4000,
    lazyLoad:"progressive",
    speed:600,
    arrows:false,
    dots:true,
    cssEase:"cubic-bezier(0.87, 0.03, 0.41, 0.9)"
  });
});

// Resize event
$(window).on("resize.slickVideoPlayer", function(){  
  resizePlayer(iframes, 16/9);
});
!
999px

Console