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HTML

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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.

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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 

              
                <article class="video-item">
  <figure>
    <a href="#post-popup1" class="open-video-link"><img src="http://www.unsplash.it/800/600"></a>
  </figure>
</article>

<div id="post-popup1" class="post-popup popup-modal">
  <span class="close"></span>
  <div class="popup-header">
    <h4>Popup Header</h4>
  </div>
  <div class="popup-video">
    <iframe width="560" height="315" src="https://www.youtube.com/embed/TWluKrCIBSY" frameborder="0" allowfullscreen></iframe>
  </div>
  <div class="popup-main">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec suscipit congue tortor. Nam varius eu nisl nec faucibus. Donec vestibulum tellus odio, accumsan fermentum tortor auctor quis. Nunc elementum viverra urna eget posuere. Proin non gravida urna. Integer dapibus turpis sit amet porttitor bibendum. Suspendisse volutpat condimentum tortor, ut imperdiet dui molestie ac. Donec malesuada convallis nulla, at varius orci malesuada ornare. Integer mauris est, gravida quis fringilla ac, feugiat id nisl. Pellentesque porttitor porttitor dui, sed pharetra quam pellentesque non. Duis sit amet nunc urna. Proin finibus dolor tempor, viverra tortor at, malesuada mauris.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec suscipit congue tortor. Nam varius eu nisl nec faucibus. Donec vestibulum tellus odio, accumsan fermentum tortor auctor quis. Nunc elementum viverra urna eget posuere. Proin non gravida urna. Integer dapibus turpis sit amet porttitor bibendum. Suspendisse volutpat condimentum tortor, ut imperdiet dui molestie ac. Donec malesuada convallis nulla, at varius orci malesuada ornare. Integer mauris est, gravida quis fringilla ac, feugiat id nisl. Pellentesque porttitor porttitor dui, sed pharetra quam pellentesque non. Duis sit amet nunc urna. Proin finibus dolor tempor, viverra tortor at, malesuada mauris.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec suscipit congue tortor. Nam varius eu nisl nec faucibus. Donec vestibulum tellus odio, accumsan fermentum tortor auctor quis. Nunc elementum viverra urna eget posuere. Proin non gravida urna. Integer dapibus turpis sit amet porttitor bibendum. Suspendisse volutpat condimentum tortor, ut imperdiet dui molestie ac. Donec malesuada convallis nulla, at varius orci malesuada ornare. Integer mauris est, gravida quis fringilla ac, feugiat id nisl. Pellentesque porttitor porttitor dui, sed pharetra quam pellentesque non. Duis sit amet nunc urna. Proin finibus dolor tempor, viverra tortor at, malesuada mauris.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec suscipit congue tortor. Nam varius eu nisl nec faucibus. Donec vestibulum tellus odio, accumsan fermentum tortor auctor quis. Nunc elementum viverra urna eget posuere. Proin non gravida urna. Integer dapibus turpis sit amet porttitor bibendum. Suspendisse volutpat condimentum tortor, ut imperdiet dui molestie ac. Donec malesuada convallis nulla, at varius orci malesuada ornare. Integer mauris est, gravida quis fringilla ac, feugiat id nisl. Pellentesque porttitor porttitor dui, sed pharetra quam pellentesque non. Duis sit amet nunc urna. Proin finibus dolor tempor, viverra tortor at, malesuada mauris.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec suscipit congue tortor. Nam varius eu nisl nec faucibus. Donec vestibulum tellus odio, accumsan fermentum tortor auctor quis. Nunc elementum viverra urna eget posuere. Proin non gravida urna. Integer dapibus turpis sit amet porttitor bibendum. Suspendisse volutpat condimentum tortor, ut imperdiet dui molestie ac. Donec malesuada convallis nulla, at varius orci malesuada ornare. Integer mauris est, gravida quis fringilla ac, feugiat id nisl. Pellentesque porttitor porttitor dui, sed pharetra quam pellentesque non. Duis sit amet nunc urna. Proin finibus dolor tempor, viverra tortor at, malesuada mauris.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec suscipit congue tortor. Nam varius eu nisl nec faucibus. Donec vestibulum tellus odio, accumsan fermentum tortor auctor quis. Nunc elementum viverra urna eget posuere. Proin non gravida urna. Integer dapibus turpis sit amet porttitor bibendum. Suspendisse volutpat condimentum tortor, ut imperdiet dui molestie ac. Donec malesuada convallis nulla, at varius orci malesuada ornare. Integer mauris est, gravida quis fringilla ac, feugiat id nisl. Pellentesque porttitor porttitor dui, sed pharetra quam pellentesque non. Duis sit amet nunc urna. Proin finibus dolor tempor, viverra tortor at, malesuada mauris.</p>
  </div>
</div>
!

CSS 

              
                * { margin: 0; padding: 0; }
a { text-decoration: none; }
$color_primary: #004eff;
$color_secondary: #ff2700;

@mixin transform($transform) {
  -ms-transform: $transform;
  -webkit-transform: $transform;
  transform: $transform;
}
.video-item { width: 100%; max-width: 600px; margin: 200px auto 0;
  figure { position: relative; width: 100%; font-size: 0;
    img { width: 100%; }
    a {
      &:before { content: ''; position: absolute; top: 50%; left: 50%; width: 65px; height: 65px; margin-top: -32.5px; margin-left: -32.5px; border-radius: 50%; background-color: rgba($color_primary, 0.9); z-index: 10; }
      &:after { content: ''; position: absolute; top: 50%; left: 50%; margin-top: -12.5px; margin-left: -7px; border: solid 13px transparent; border-left: solid 20px; border-left-color: #fff; z-index: 10; }
      &:hover {
        &:before { background-color: rgba($color_secondary, 0.9); }
      }
    }
  }
}
.modal-open { overflow: hidden; }

.lightbox { position: fixed; width: 100%; height: 100%; top: 0; left: 0; background-color: rgba(255,255,255,0.8); padding: 120px 10px; display: none; box-sizing: border-box; overflow: auto; z-index: 100; }

.popup-modal { position: relative; margin: 0 auto; display: none;
  .close { position: absolute; top: 18px; right: 30px; width: 28px; height: 28px; border: solid 1px $color_primary; border-radius: 50%; @include transform(rotate(45deg)); cursor: pointer;
    &:before { position: absolute; width: 14px; height: 2px; top: 50%; left: 50%; margin-left: -7px; background-color: $color_primary; content: ''; @include transform(translateY(-50%)); }
    &:after { position: absolute; width: 14px; height: 2px; top: 50%; right: 50%; margin-right: -7px; background-color: $color_primary; content: ''; @include transform(translateY(-50%) rotate(90deg)); }
    &:hover { border-color: $color_secondary;
      &:before { background-color: $color_secondary; }
      &:after { background-color: $color_secondary; }
    }
  }
}

.post-popup { width: 100%; max-width: 875px; background-color: #fff; box-shadow: 0 2px 12px rgba(0,0,0,0.22);
  .popup-header { padding: 20px 30px; font-size: 14px; margin-right: 60px;
  }
  .popup-video { font-size: 0;
    video { width: 100%; }
    img { width: 100%; }
  }
  .popup-main { padding: 40px 30px;
    p { margin: 0 0 10px 0; }
  }
}
!

JS 

              
                jQuery(function($){

    // Lightbox Triggers
    $(".open-video-link").videoBox();
});
/* ========================================================================= */
/* FUNCTION TO CREATE LIGHTBOX */
/* ========================================================================= */

jQuery.fn.extend({
    videoBox : function() {
        var self, link, target, video, videoSrc, toggle;
        this.each(function() {
            self = this;
            target = $(self).attr("href");
            video = $(target).find(".popup-video iframe");
            videoSrc = $(video).attr("src");
          
            $(this).on("click", function(event) {
                event.preventDefault ? event.preventDefault() : event.returnValue = false;
                $(target).wrap( "<div class='lightbox'></div>" );
                $(".lightbox").fadeIn(300, function() {
                    $(target).fadeIn(0);
                    $("body").addClass("modal-open");
                    $(video).attr("src",videoSrc+'?autoplay=1');
                    resizeIfame(video);
                });

                $("body").on("click", function(event) {
                    if(($(event.target).hasClass("lightbox") || $(event.target).hasClass("close")) && $(target).parent().hasClass("lightbox") ) {
                        $(".lightbox").fadeOut(300, function() {
                            $(target).hide(0);
                            $(target).unwrap();
                        });
                        $("body").removeClass("modal-open");
                        $(video).attr("src",videoSrc);
                    }
                });
            });
        });
    }
});


/* ========================================================================= */
/* RESIZE IFRAME VIDEO FUNCTION */
/* ========================================================================= */
function resizeIfame(frame) {

    var oldWidth = $(frame).width();
    var oldHeight = $(frame).height();
    var propotion = oldHeight / oldWidth;
    var newHeight;

    $(frame).width('100%');
    newHeight = $(frame).width() * propotion;
    $(frame).height(newHeight);

    $(window).resize(function() {
        $(frame).width('100%');
        newHeight = $(frame).width() * propotion;
        $(frame).height(newHeight);
    });
}
!
999px

Console