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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>

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.

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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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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <!DOCTYPE html>
<html>
<head>
    <title>My Simple Blog</title>
</head>
<body>
    <header>
        <h1>My Blog</h1>
        <nav>
            <ul>
                <li><a href="#">Home</a></li>
                <li><a href="#">About</a></li>
                <li><a href="#">Contact</a></li>
            </ul>
        </nav>
    </header>
    <main>
        <article>
            <h2>Blog Post Title</h2>
            <p>Content of the first blog post...</p>
        </article>
        <article>
            <h2>Another Blog Post</h2>
            <p>Content of the second blog post...</p>
        </article>
        <!-- More articles can be added here -->
    </main>
    <footer>
        <p>© 2023 My Simple Blog</p>
    </footer>
</body>
</html>
!

CSS 

              
                body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f8f8; /* Light background for the entire page */
}

header {
    background-color: #6a1b9a; /* Vibrant purple header */
    color: #ffffff;
    text-align: center;
    padding: 1em 0;
}

header nav ul {
    list-style: none;
    padding: 0;
}

header nav ul li {
    display: inline;
    margin: 0 15px;
}

header nav ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: bold;
}

main {
    margin: 20px;
    background-color: #ffffff; /* White background for the main content */
    padding: 20px;
    border-radius: 8px; /* Rounded corners for the main content area */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* Subtle shadow for depth */
}

article {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eeeeee; /* Separator for articles */
}

article h2 {
    color: #333333; /* Dark text for titles */
    margin-bottom: 10px;
}

article p {
    color: #666666; /* Lighter text for the body */
    line-height: 1.6; /* Improved readability */
}

footer {
    background-color: #6a1b9a; /* Matching the header's vibrant purple */
    color: #ffffff;
    text-align: center;
    padding: 1em 0;
}
!

JS
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999px

Console