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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <input type="checkbox" name="dialog_state" id="dialog_state" class="dialog_state">
<div id='dialog'>
  <label id="dlg-back" for="dialog_state"></label>
  <div id='dlg-wrap'>
    <label id="dlg-close" for="dialog_state"><i class="icon ion-ios-close-empty"></i></label>
    <h2 id='dlg-header'>Are you sure?</h2>
    <div id='dlg-content'>You are about to kill a puppy, that's some serious shit. Have you really thought this through?</div>
    <div id='dlg-prompt'>
      <div class='button positive'><i class="icon ion-ios-checkmark-empty"></i> Yes, let's do it!</div>
      <div class='button'><i class="icon ion-ios-close-empty"></i> No, I'll reconsider</div>
    </div>
  </div>
</div>
<main id='main' class='main_area'>
  <div class='center'>
    <label class="button" for="dialog_state"><i class="icon ion-ios-upload-outline
      "></i> Open the dialog</label>
  </div>
<div id='console'></div>
</main>
!

CSS 

              
                #console {display: none;}
#dialog {
  position: absolute;
  z-index: 9999;
  top: 0;
  left: 0;
  width: 100%;
  width: 100vw;
  height: 100vh;
  background: rgba(0,0,0,0.15);
  transition: visibility 0s linear 0.5s,opacity 0.5s linear;
  opacity: 0;
  visibility: hidden;
}
.dialog_state {
  visibility: hidden;
  opacity: 0;
  display: none;
}
.dialog_state:checked + #dialog,
#dialog.dialog_open {
  transition-delay:0s;
  opacity: 1;
  visibility: visible;
}
#dlg-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  width: 100vw;
  height: 100vh;
  cursor: pointer;
}
.dialog_state:checked + #dialog #dlg-wrap {
  max-height: 24rem;
  opacity: 1;
  padding: 2rem;
}
#dlg-wrap {
  position: relative;
  z-index: 1;
  display: block;
  box-sizing: border-box;
  margin: 0 auto;
  top: 50%;
  transform: translateY(-50%);
  width: 640px;
  padding: 2rem;
  border-radius: 0.25rem;
  /*border: 1px solid #969696;*/
  background: #fff;
  box-shadow: 1px 1px 6px rgba(0,0,0,0.3);
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
  overflow: hidden;
  transition: all .5s;
}
#dlg-close {
  position: absolute;
  top: 0;
  right: 0;
  width: 2rem;
  height: 2rem;
  line-height: 2rem;
  text-align: center;
  cursor: pointer;
}
h2#dlg-header {
  font: 200 2em/1em Raleway, Open Sans, Arial, Sans-Serif;
  text-transform: initial;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
}
#dlg-content {
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0.015em;
}
#dlg-prompt .button {
  margin: 1rem 0.5rem;
  border-radius: 1.5rem;
}



.main_area {
  transition: all 0.5s ease-out;
}
.dialog_state:checked ~ .main_area,
.main_area.dialog_open {
  filter: blur(6px);
}

.button, a.button {
  display: inline-block;
  padding: 0.25em 1em;
  box-sizing: border-box;
  
  background: #ffffff;
  color: #606060;
  text-decoration: none;
  letter-spacing: 0.075em;
  line-height: 2rem;
  font-family: Raleway, Open Sans, Arial;
  font-weight: 300;
  font-size: 0.85em;
  border-radius: 4px;
  border: 1px solid #e0e0e0;
  
  transition: .1s all;
  cursor: pointer;
}
.button:hover, a.button:hover {
  color: #a0a0a0;
  background: #f8f8f8;
  box-shadow: 0 1px 1px rgba(0,0,0,0.05);
  /*transform: scale(1.01);*/
}
.button.positive, a.button.positive {
  border-color: #6199B7;
  color: #6199B7;
}
.button.positive:hover, a.button.positive:hover {
  border-color: #468FB6;
  color: #fff;
  background-color: #468FB6;
}

.icon {
  vertical-align: middle;
  line-height: inherit;
  font-size: 1.75em;
}

body {
  font: 400 16px/1.65em Open Sans, Arial, Sans-Serif;
  letter-spacing: -0.015em;
  color: #303030;
  text-align: center;
}
#main {
  height: 100vh;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
  background: url("https://farm6.staticflickr.com/5688/21515632899_94e4ddb78a_o.jpg") no-repeat center center;
  background-size: cover;
}
#main .center {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
}
h1 {
  font: 900 6.4em/1em Raleway, Open Sans, Arial, Sans-Serif;
  text-transform: uppercase;
  letter-spacing: -0.05em;
  margin: 2rem 0 0.5rem;
}
h2 {
  font: 800 2em/1em Raleway, Open Sans, Arial, Sans-Serif;
  text-transform: uppercase;
  letter-spacing: 0.0em;
  margin: 2rem 0 0.5rem;
}


/* Console */
#console {position: absolute;bottom: 0;left: 0;width: 100%;height: 100px;box-sizing: border-box;background: #f0f0f0;color: #606060;font: 400 13px/16px Open Sans;letter-spacing: 0em;text-align: left;padding: 2px;overflow-y: scroll;0 } #console p {margin: 0; padding: 0;} #console p em {font-style: none;font-weight: 700;}
!

JS 

              
                $(function(){
  $(document).keypress(function(e) {
    cwrite(e.which,'Keypress event');
    if(e.which==120) custom_dialog_toggle('Keypress x','You opened this window by pressing x');
  });
});
function custom_dialog_toggle(title,text,buttons) {
  if(typeof title !=='undefined') $('#dlg-header').html(title);
  if(typeof text !=='undefined') $('#dlg-content').html(text);
  cwrite('Current state: '+$('#dialog_state').prop("checked"),'custom_dialog_toggle');
  $('#dialog_state').prop("checked", !$('#dialog_state').prop("checked"));
}
// Console logging function for debugging
// cwrite(str, title)
//      str:              string to be appended to console
//      title (optional): title of the string
// (c)  Tuomas Hatakka 2015
//      http://tuomashatakka.fi
function cwrite(str,title) {
  var ce = $('#console');
  var sg = "<p>";
  if(typeof title !=='undefined') sg = sg+"<em>"+title+"</em> ";
  sg = sg+str+"</p>";
  ce.prepend(sg);
  //if(ce.children("p").length>6) ce.children("p").first().remove();
}
!
999px

Console