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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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Packages

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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 class="parent">
      <div class="fixed-child"><h1 class="title">Fixed Position Relative to Parent</h1></div>
      <div class="text">
        Lorem ipsum dolor sit amet consectetur adipisicing elit. Asperiores in
        provident nisi accusantium iusto cum incidunt mollitia consequuntur ab!
        Nesciunt, fugit natus quas, tempore molestiae saepe in, officiis quo
        sint modi a! Optio suscipit voluptatem, rerum eius repudiandae dolore
        accusantium, quasi aliquam dignissimos reprehenderit magni aliquid
        doloribus, sapiente cumque. Molestiae expedita, sequi natus quia quos
        quae ullam minus id nesciunt iure assumenda ducimus. Iusto delectus
        commodi dicta facilis explicabo et voluptatum architecto temporibus
        perspiciatis repellendus omnis, cumque, eaque voluptate aspernatur.
        Similique quaerat expedita, harum consequuntur sint pariatur quo facere
        sed, quasi ad tempora sequi distinctio corrupti odit? Sequi, natus
        nobis. Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Asperiores in provident nisi accusantium iusto cum incidunt mollitia
        consequuntur ab! Nesciunt, fugit natus quas, tempore molestiae saepe in,
        officiis quo sint modi a! Optio suscipit voluptatem, rerum eius
        repudiandae dolore accusantium, quasi aliquam dignissimos reprehenderit
        magni aliquid doloribus, sapiente cumque. Molestiae expedita, sequi
        natus quia quos quae ullam minus id nesciunt iure assumenda ducimus.
        Iusto delectus commodi dicta facilis explicabo et voluptatum architecto
        temporibus perspiciatis repellendus omnis, cumque, eaque voluptate
        aspernatur. Similique quaerat expedita, harum consequuntur sint pariatur
        quo facere sed, quasi ad tempora sequi distinctio corrupti odit? Sequi,
        natus nobis. Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Asperiores in provident nisi accusantium iusto cum incidunt mollitia
        consequuntur ab! Nesciunt, fugit natus quas, tempore molestiae saepe in,
        officiis quo sint modi a! Optio suscipit voluptatem, rerum eius
        repudiandae dolore accusantium, quasi aliquam dignissimos reprehenderit
        magni aliquid doloribus, sapiente cumque. Molestiae expedita, sequi
        natus quia quos quae ullam minus id nesciunt iure assumenda ducimus.
        Iusto delectus commodi dicta facilis explicabo et voluptatum architecto
        temporibus perspiciatis repellendus omnis, cumque, eaque voluptate
        aspernatur. Similique quaerat expedita, harum consequuntur sint pariatur
        quo facere sed, quasi ad tempora sequi distinctio corrupti odit? Sequi,
        natus nobis. Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Asperiores in provident nisi accusantium iusto cum incidunt mollitia
        consequuntur ab! Nesciunt, fugit natus quas, tempore molestiae saepe in,
        officiis quo sint modi a! Optio suscipit voluptatem, rerum eius
        repudiandae dolore accusantium, quasi aliquam dignissimos reprehenderit
        magni aliquid doloribus, sapiente cumque. Molestiae expedita, sequi
        natus quia quos quae ullam minus id nesciunt iure assumenda ducimus.
        Iusto delectus commodi dicta facilis explicabo et voluptatum architecto
        temporibus perspiciatis repellendus omnis, cumque, eaque voluptate
        aspernatur. Similique quaerat expedita, harum consequuntur sint pariatur
        quo facere sed, quasi ad tempora sequi distinctio corrupti odit? Sequi,
        natus nobis. Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Asperiores in provident nisi accusantium iusto cum incidunt mollitia
        consequuntur ab! Nesciunt, fugit natus quas, tempore molestiae saepe in,
        officiis quo sint modi a! Optio suscipit voluptatem, rerum eius
        repudiandae dolore accusantium, quasi aliquam dignissimos reprehenderit
        magni aliquid doloribus, sapiente cumque. Molestiae expedita, sequi
        natus quia quos quae ullam minus id nesciunt iure assumenda ducimus.
        Iusto delectus commodi dicta facilis explicabo et voluptatum architecto
        temporibus perspiciatis repellendus omnis, cumque, eaque voluptate
        aspernatur. Similique quaerat expedita, harum consequuntur sint pariatur
        quo facere sed, quasi ad tempora sequi distinctio corrupti odit? Sequi,
        natus nobis. Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Asperiores in provident nisi accusantium iusto cum incidunt mollitia
        consequuntur ab! Nesciunt, fugit natus quas, tempore molestiae saepe in,
        officiis quo sint modi a! Optio suscipit voluptatem, rerum eius
        repudiandae dolore accusantium, quasi aliquam dignissimos reprehenderit
        magni aliquid doloribus, sapiente cumque. Molestiae expedita, sequi
        natus quia quos quae ullam minus id nesciunt iure assumenda ducimus.
        Iusto delectus commodi dicta facilis explicabo et voluptatum architecto
        temporibus perspiciatis repellendus omnis, cumque, eaque voluptate
        aspernatur. Similique quaerat expedita, harum consequuntur sint pariatur
        quo facere sed, quasi ad tempora sequi distinctio corrupti odit? Sequi,
        natus nobis.Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Asperiores in provident nisi accusantium iusto cum incidunt mollitia
        consequuntur ab! Nesciunt, fugit natus quas, tempore molestiae saepe in,
        officiis quo sint modi a! Optio suscipit voluptatem, rerum eius
        repudiandae dolore accusantium, quasi aliquam dignissimos reprehenderit
        magni aliquid doloribus, sapiente cumque. Molestiae expedita, sequi
        natus quia quos quae ullam minus id nesciunt iure assumenda ducimus.
        Iusto delectus commodi dicta facilis explicabo et voluptatum architecto
        temporibus perspiciatis repellendus omnis, cumque, eaque voluptate
        aspernatur. Similique quaerat expedita, harum consequuntur sint pariatur
        quo facere sed, quasi ad tempora sequi distinctio corrupti odit? Sequi,
        natus nobis.
      </div>
    </div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");

body {
  font-family: "Poppins", sans-serif;
}

.parent {
  position: relative;
  text-align: justify;
  padding-bottom: 24px;
  width: 800px;
  height: 300px;
  margin: 100px auto;
  background-color: #f1f8e8;
  border: 2px solid #d8efd3;
  overflow: hidden;
}

.fixed-child {
  position: fixed;
  width: inherit;
  top: 101px;
  left: inherit;
  background-color: #95d2b3;
  border: 1px solid #95d2b3;
  height: 50px;
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.title {
  font-weight: bold;
  font-size: 22px;
  margin-left: 20px;
}

.text {
  padding: 20px;
  margin-top: 34px;
  overflow-y: scroll;
  height: 300px;
}

/* ===== Scrollbar CSS ====== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background-color: #cccccc;
  background-clip: padding-box;
  border: 2px solid transparent;
  border-radius: 6px;
  height: 150px;
  width: 8px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: #ababab;
}

::-webkit-scrollbar-thumb:active {
  background-color: #ababab;
}
!

JS
!
999px

Console