Remove arrow dropdown Bootstrap - html

Question

I'm using a bootstrap template which includes an accordion menu.
Now on one part of the page I don't need the items to open to show additional text, so I would like to remove the arrows.
I have looked around and tried several options, but have not succeeded yet.
The class that provides the arrow is the class 'accordion-button' I presume.
Does anybody have an idea how to proceed?
HTML:
<div class="accordion accordion-flush" id="accordionFlushExample">
<div class="accordion-item">
<h2 class="accordion-header" id="flush-headingOne">
<button class="accordion-button collapsed" type="button" data-bs-target="#flush-collapseThree" aria-expanded="false" aria-controls="flush-collapseThree"> #1 Nettoyage à haute pression avec ou sans produit tensio-actif
</button>
</h2>
</div>
CSS:
.accordion-flush .accordion-item .accordion-button {
background-color: #FED005!important;
color: #25327B ;
}
.accordion-button:link, .accordion-button:visited, .accordion-button:hover, .accordion-button:active {
background-color: #5500C9 !important;
color:#FFF !important;
text-decoration: none !important;
border: hidden !important;
border-color: #FFF !important;
box-shadow: 0px !important;
}
.accordion-button:focus {
z-index: 3;
border-color: #FFF !important;
outline: 0;
box-shadow: none !important;
}
.accordion-button:focus {
border-color: none;
-webkit-box-shadow: none;
box-shadow: none;
}
.accordion-button:hover, .accordion-button:active {
color: #25327B !important;
font-weight: bold;
}

Answer 1

I see accordion-flush class so I assume you are using bootstrap-5.
Bootstrap 5 accordion arrow is control by the ::after pseudo element, therefore just overwirte relevant CSS attribute :
.accordion-button:not(.collapsed)::after,
.accordion-button::after {
background-image: unset !important;
}
.accordion-button:not(.collapsed)::after,
.accordion-button::after {
background-image: unset !important;
}
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GLhlTQ8iRABdZLl6O3oVMWSktQOp6b7In1Zl3/Jr59b6EGGoI1aFkw7cmDA6j6gD" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" integrity="sha384-w76AqPfDkMBDXo30jS1Sgez6pr3x5MlQ1ZAGC+nuZB+EYdgRZgiwxhTBTkF7CXvN" crossorigin="anonymous"></script>
<div class="accordion accordion-flush" id="accordionFlushExample">
<div class="accordion-item">
<h2 class="accordion-header" id="flush-headingOne">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseOne" aria-expanded="false" aria-controls="flush-collapseOne">
Accordion Item #1
</button>
</h2>
<div id="flush-collapseOne" class="accordion-collapse collapse" aria-labelledby="flush-headingOne" data-bs-parent="#accordionFlushExample">
<div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the first item's accordion body.</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header" id="flush-headingTwo">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseTwo" aria-expanded="false" aria-controls="flush-collapseTwo">
Accordion Item #2
</button>
</h2>
<div id="flush-collapseTwo" class="accordion-collapse collapse" aria-labelledby="flush-headingTwo" data-bs-parent="#accordionFlushExample">
<div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the second item's accordion body. Let's imagine this being filled with some actual content.</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header" id="flush-headingThree">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseThree" aria-expanded="false" aria-controls="flush-collapseThree">
Accordion Item #3
</button>
</h2>
<div id="flush-collapseThree" class="accordion-collapse collapse" aria-labelledby="flush-headingThree" data-bs-parent="#accordionFlushExample">
<div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the third item's accordion body. Nothing more exciting happening here in terms of content, but just filling up the space to make it look, at least at first glance, a bit more representative of how this would look in a real-world application.</div>
</div>
</div>
</div>