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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

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About the <head>

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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

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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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 

              
                  <body>
      <!-- button to launch the modal -->
    <button class="show-modal">Log       In</button>

    <!-- the modal itself -->
    <div class="modal hidden">

        <!-- button to close the modal -->
      <button class="close-modal">&times;</button>
      
      <h1>Welcome back, friend😍</h1>
      <form action="">
          <input type="email" id="" placeholder="Email">
          <input type="password" id="" placeholder="Password">
          <button type="submit">Log in</button>
          <p>Don't have an account? <a href="">Sign up</a></p>
      </form>
    </div>
    <div class="overlay hidden"></div>

    <script src="js/script.js"></script>
  </body>
!

CSS 

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  color: #333;
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.show-modal {
  font-size: 2rem;
  font-weight: 600;
  padding: 1.2rem 2.5rem;
  margin: 5rem 2rem;
  border: none;
  background-color: rgb(92, 22, 139);
  color: rgb(241, 241, 241);
  border-radius: 0.5rem;
  cursor: pointer;
}

.modal {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  max-width: 500px;
  background-color: white;
  padding: 4rem;
  border-radius: 5px;
  box-shadow: 0 3rem 5rem rgba(0, 0, 0, 0.3);
  z-index: 10;
  text-align: center;
}

.modal h1 {
  font-size: 1.8rem;
  margin-bottom: 2rem;
}

p {
  font-size: 1.1rem;
}
a {
  text-decoration: none;
  color: rgb(2, 0, 145);
}

form input,
form button {
  display: block;
  width: 100%;
  margin: 1.3rem 0;
  border-radius: 5px;
  border: none;
  outline: none;
  padding: 1rem;
  font-size: 1.1rem;
}

form input {
  box-shadow: inset 2px 2px 5px #babecc,     inset -5px -5px 10px #ffffff73;
}

form button {
  background-color: rgb(2, 0, 145);
  color: #fff;
}
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  z-index: 5;
}

.close-modal {
  position: absolute;
  top: 0.8rem;
  right: 1.3rem;
  font-size: 2.5rem;
  color: #333;
  cursor: pointer;
  border: none;
  background: none;
}

/* CLASS TO HIDE MODAL */
.hidden {
  display: none;
}
!

JS 

              
                const modal = document.querySelector(".modal"); //selects the modal
const btnCloseModal = document.querySelector(".close-modal"); //selects the button to close the modal
const btnOpenModal = document.querySelector(".show-modal"); //selects the button to show the modal
const overlay = document.querySelector(".overlay"); //selects the overlay

const toggleModal = function () {
  modal.classList.toggle("hidden");
  overlay.classList.toggle("hidden");
};

btnOpenModal.addEventListener("click", toggleModal);

btnCloseModal.addEventListener("click", toggleModal);

overlay.addEventListener("click", toggleModal);
!
999px

Console