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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.

!
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.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

              
                <div id="app" class="text-black antialiased">
  <!-- RECENT -->
  <div v-if="!doShowChat" class="h-screen flex flex-col">
    <!-- top bar -->
    <div class="border-b border-grey-light pt-8 px-4">
      <div class="text-3xl font-bold pb-3 pt-5">
        Recent
      </div>
    </div>
    <!-- content -->
    <div class="flex-1 overflow-scroll pt-2">
      <!-- list item -->
      <div class="flex items-center py-2 hover:bg-gray-100 cursor-pointer" @click="doShowChat = true; selectedChat = 'Joe Cole'">
        <div class="w-16 h-16 rounded-full bg-grey-lighter ml-3 mr-3 overflow-hidden">
          <img src="https://images-na.ssl-images-amazon.com/images/M/MV5BMTc2NjczMzQwMV5BMl5BanBnXkFtZTgwNTczMzcxNjE@._V1_UY256_CR42,0,172,256_AL_.jpg" class="w-16">
        </div>
        <div>
          <div>Joe Cole</div>
          <div class="text-grey-dark pt-1">Sounds good, thanks!</div>
        </div>
      </div>
      <!-- list item -->
      <div class="flex items-center py-2 hover:bg-gray-100 cursor-pointer" @click="doShowChat = true; selectedChat = 'Michael B. Jordan'">
        <div class="w-16 h-16 rounded-full bg-grey-lighter ml-3 mr-3 overflow-hidden">
          <img src="https://m.media-amazon.com/images/M/MV5BMjExOTY3NzExM15BMl5BanBnXkFtZTgwOTg1OTAzMTE@._V1_UX172_CR0,0,172,256_AL_.jpg" class="w-16">
        </div>
        <div>
          <div>Michael B. Jordan</div>
          <div class="text-grey-dark pt-1">Are you joining us for...</div>
        </div>
      </div>
      <!-- list item -->
      <div class="flex items-center py-2 hover:bg-gray-100 cursor-pointer" @click="doShowChat = true; selectedChat = 'Linnea Berthelsen'">
        <div class="w-16 h-16 rounded-full bg-grey-lighter ml-3 mr-3 overflow-hidden">
          <img src="https://images-na.ssl-images-amazon.com/images/M/MV5BN2JhY2M2Y2QtZDBjOS00MjY2LWJhMjEtZWNjNTQ3MTE0YzBlXkEyXkFqcGdeQXVyNjE5MDgzMjI@._V1_UY256_CR10,0,172,256_AL_.jpg" class="w-16">
        </div>
        <div>
          <div>Linnea Berthelsen</div>
          <div class="text-grey-dark pt-1">Hopefully 🤞💁‍♀️</div>
        </div>
      </div>
      <!-- list item -->
      <div class="flex items-center py-2 hover:bg-gray-100 cursor-pointer" @click="doShowChat = true; selectedChat = 'Veronika Ngo'">
        <div class="w-16 h-16 rounded-full bg-grey-lighter ml-3 mr-3 overflow-hidden">
          <img src="https://images-na.ssl-images-amazon.com/images/M/MV5BNjc3NTI5Mzk2NV5BMl5BanBnXkFtZTgwMDgzNjM2MDI@._V1_UX172_CR0,0,172,256_AL_.jpg" class="w-16">
        </div>
        <div>
          <div>Veronika Ngo</div>
          <div class="text-grey-dark pt-1">I would love to but I need...</div>
        </div>
      </div>
      <!-- list item -->
      <div class="flex items-center py-2 hover:bg-gray-100 cursor-pointer" @click="doShowChat = true; selectedChat = 'Zack Ward'">
        <div class="w-16 h-16 rounded-full bg-grey-lighter ml-3 mr-3 overflow-hidden">
          <img src="https://images-na.ssl-images-amazon.com/images/M/MV5BMjA4ODk0MDMwM15BMl5BanBnXkFtZTcwODMxNDc4Nw@@._V1_UY256_CR74,0,172,256_AL_.jpg" class="w-16">
        </div>
        <div>
          <div>Zack Ward</div>
          <div class="text-grey-dark pt-1">🔥🔥🔥</div>
        </div>
      </div>
    </div>
  </div>
  <!-- CHAT -->
  <div v-if="doShowChat" class="h-screen flex flex-col">
    <!-- top bar -->
    <div class="flex items-center border-b border-grey-light py-3 px-4">
      <div class="w-8 text-2xl pt-1" @click="doShowChat = false">
        <div class="ion-md-arrow-back text-2xl text-teal-500 cursor-pointer"></div>
      </div>
      <div class="flex-1 text-center text-lg font-bold">{{selectedChat}}</div>
      <div class="w-8"></div>
    </div>
    <!-- content -->
    <div class="flex-1 overflow-scroll flex flex-col-reverse px-4">
      <!-- message -->
      <div class="flex py-2">
        <div class="flex-1"></div>
        <div class="bg-teal-500 rounded-full text-white px-3 py-2">Thanks a lot! 😌</div>
      </div>
      <!-- message -->
      <div class="flex py-2">
        <div class="bg-gray-200 rounded-full px-3 py-2">Got you a coffee. It’s on your desk.</div>
        <div class="flex-1"></div>
      </div>
    </div>
    <!-- bottom bar -->
    <div class="flex items-center pb-3 px-4 pt-3">
      <div class="flex-1">
        <input type="text" class="w-full border border-grey-light rounded-full px-4 py-2" placeholder="Enter you message">
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                input, textarea, button:focus {
  outline: none;
}

input::placeholder {
  color: #cbd5e0;
  opacity: 1;
}
!

JS 

              
                var app = new Vue({
  el: '#app',
  data: {
    doShowChat: false,
    selectedChat: ''
  },
  methods: {
    // functions go here
  }
})
!
999px

Console