As a beginner in web development, I am currently working on my very first website. One issue I'm facing is with incorporating an accordion-style card in my webpage. Although it allows me to click on different titles, the collapsed ones fail to expand and show the descriptions inside. Any suggestions on what mistake I might be making and how to rectify it?

https://i.stack.imgur.com/FXwq0.png

<div class="col col-sm order-sm-first col-md">
        <div class="col">
            <h2>Corporate Leadership</h2>

            <div class="accordian">
                <div class="card">
                    <div class="card-header" role="tab" id="peterhead">
                        <h3 class="mb-0">
                            <a data-toggle="collapse" data-target="#peter">
                                Peter Pan <small>Chief Epicurious Officer</small>
                            </a>
                        </h3>
                    </div>
                    <div class="collapse show" id="peter" data-parent="#accordion">
                        <div class="card-body">
                            <p class="d-none d-sm-block">Our CEO, Peter, credits his hardworking East Asian immigrant parents who undertook the arduous journey
                                to the shores of America with the intention of giving their children the best future. His mother's
                                wizardy in the kitchen whipping up the tastiest dishes with whatever is available inexpensively at
                                the supermarket, was his first inspiration to create the fusion cuisines for which
                                <em>The Frying Pan</em> became well known. He brings his zeal for fusion cuisines to this restaurant,
                                pioneering cross-cultural culinary connections.</p>
                        </div>
                    </div>
                </div>
                <div class="card">
                    <div class="card-header" role="tab" id="dannyhead">
                        <h3 class="mb-0">
                            <a class="collapsed" data-toggle="collapse" data-target="#danny">
                                Dhanasekaran Witherspoon <small>Chief Food Officer</small>
                            </a>
                        </h3>
                    </div>
                    <div class="collapse" id="danny" data-parent="#accordion">
                        <div class="card-body">
                            <p class="d-none d-sm-block">Our CFO, Danny, as he is affectionately referred to by his colleagues, comes from a long established
                                family tradition in farming and produce. His experiences growing up on a farm in the Australian outback
                                gave him great appreciation for varieties of food sources. As he puts it in his own words,
                                <em>Everything that runs, wins, and everything that stays, pays!</em></p>
                        </div>
                    </div>
                </div>
                <div class="card">
                    <div class="card-header" role="tab" id="agumbehead">
                        <h3 class="mb-0">
                            <a class="collapsed" data-toggle="collapse" data-target="#agumbe">
                                Agumbe Tang <small>Chief Taste Officer</small>
                            </a>
                        </h3>
                    </div>
                    <div class="collapse" id="agumbe" data-parent="#accordion">
                        <div class="card-body">
                            <p class="d-none d-sm-block">Blessed with the most discerning gustatory sense, Agumbe, our CTO, personally ensures that every dish
                                that we serve meets his exacting tastes. Our chefs dread the tongue lashing that ensues if their
                                dish does not meet his exacting standards. He lives by his motto,
                                <em>You click only if you survive my lick.</p>
                        </div>
                    </div>
                </div>
                <div class="card">
                    <div class="card-header" role="tab" id="albertohead">
                        <h3 class="mb-0">
                            <a class="collapsed" data-toggle="collapse" data-target="#alberto">
                                Alberto Somayya <small>Executive Chef</small>
                            </a>
                        </h3>
                    </div>
                    <div class="collapse" id="alberto" data-parent="#accordion">
                        <div class="card-body">
                            <p class="d-none d-sm-block">Award-winning three-star Michelin chef with wide International experience having worked closely with
                                whos-who in the culinary world, he specializes in creating mouthwatering Indo-Italian fusion experiences.
                                He says, <em>Put together the cuisines from the two craziest cultures, and you get a winning hit! Amma Mia!</em></p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>