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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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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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HTML 

              
                <h1 class="text-center">Bootstrap 5 Process Steps</h1>

<section>
        <div class="container">
            <div class="accordion" id="accordionExample">
                <div class="steps">
                    <progress id="progress" value=0 max=100 ></progress>
                    <div class="step-item">
                        <button class="step-button text-center" type="button" data-toggle="collapse"
                            data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
                            1
                        </button>
                        <div class="step-title">
                            First Step
                        </div>
                    </div>
                    <div class="step-item">
                        <button class="step-button text-center collapsed" type="button" data-toggle="collapse"
                            data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                            2
                        </button>
                        <div class="step-title">
                            Second Step
                        </div>
                    </div>
                    <div class="step-item">
                        <button class="step-button text-center collapsed" type="button" data-toggle="collapse"
                            data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
                            3
                        </button>
                        <div class="step-title">
                            Third Step
                        </div>
                    </div>
                </div>

                <div class="card">
                    <div  id="headingOne">
                        
                    </div>

                    <div id="collapseOne" class="collapse show" aria-labelledby="headingOne"
                        data-parent="#accordionExample">
                        <div class="card-body">
                             <a href="https://www.youtube.com/channel/UCfwvGU9rkEhabpZnHj2QRnQ" target="_blank">Product placement for my youtube channel :)</a>. Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad
                            squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa
                            nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid
                            single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft
                            beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice
                            lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you
                            probably haven't heard of them accusamus labore sustainable VHS.
                        </div>
                    </div>
                </div>
                <div class="card">
                    <div  id="headingTwo">
                        
                    </div>
                    <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample">
                        <div class="card-body">
                            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad
                            squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa
                            nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid
                            single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft
                            beer labore wes anderson cred nesciunt sapiente ea proident.  <a href="https://www.youtube.com/channel/UCfwvGU9rkEhabpZnHj2QRnQ" target="_blank">Product placement for my youtube channel :)</a>.Ad vegan excepteur butcher vice
                            lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you
                            probably haven't heard of them accusamus labore sustainable VHS.
                        </div>
                    </div>
                </div>
                <div class="card">
                    <div  id="headingThree">
                        
                    </div>
                    <div id="collapseThree" class="collapse" aria-labelledby="headingThree"
                        data-parent="#accordionExample">
                        <div class="card-body">
                          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad
                            squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa
                            nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid
                            single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft
                            beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice
                            lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you
                            probably haven't heard of them accusamus labore sustainable VHS.  <a href="https://www.youtube.com/channel/UCfwvGU9rkEhabpZnHj2QRnQ" target="_blank">Product placement for my youtube channel :)</a>.
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </section>
!

CSS 

              
                :root {
    --prm-color: #0381ff;
    --prm-gray: #b1b1b1;
}
/*  unnecessary */
body {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-evenly;
  flex-direction:column;
}
section{
  width:100%;
}
/*  unnecessary finished*/

/* CSS */
.steps {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    position: relative;
}

.step-button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background-color: var(--prm-gray);
    transition: .4s;
}

.step-button[aria-expanded="true"] {
    width: 60px;
    height: 60px;
    background-color: var(--prm-color);
    color: #fff;
}

.done {
    background-color: var(--prm-color);
    color: #fff;
}

.step-item {
    z-index: 10;
    text-align: center;
}

#progress {
  -webkit-appearance:none;
    position: absolute;
    width: 95%;
    z-index: 5;
    height: 10px;
    margin-left: 18px;
    margin-bottom: 18px;
}

/* to customize progress bar */
#progress::-webkit-progress-value {
    background-color: var(--prm-color);
    transition: .5s ease;
}

#progress::-webkit-progress-bar {
    background-color: var(--prm-gray);

}

a {
background-color: #ffff0047;
}
!

JS 

              
                 const stepButtons = document.querySelectorAll('.step-button');
        const progress = document.querySelector('#progress');

        Array.from(stepButtons).forEach((button,index) => {
            button.addEventListener('click', () => {
                progress.setAttribute('value', index * 100 /(stepButtons.length - 1) );//there are 3 buttons. 2 spaces.

                stepButtons.forEach((item, secindex)=>{
                    if(index > secindex){
                        item.classList.add('done');
                    }
                    if(index < secindex){
                        item.classList.remove('done');
                    }
                })
            })
        })
!
999px

Console