I tried it and inspected everything in the browser. Somehow it doesn’t work. I’ve pasted my HTML code below. Also tried to paste the sample code you posted into a default template to test and that also didn’t work in 3 different browsers.
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Academy kitties </title>
<link rel="stylesheet" href="assets/bootstrap/css/bootstrap.min.css">
<link rel="stylesheet" href="assets/css/mystyle.css">
<link rel="stylesheet" href="assets/css/animations.css">
<link rel="stylesheet" href="assets/css/cats.css">
<link rel="stylesheet" href="assets/css/colors.css">
<link rel="stylesheet" href="assets/css/factory.css">
<link rel="stylesheet" href="assets/css/frontend.css">
</head>
<body>
<div class="container p-5" style="margin-top: 12vh;margin-bottom: 10vh;">
<div align="center">
<h1 class="c-white">Kitties-Factory</h1>
<p class="c-white">Create your custom Kitty</p>
</div>
<div class="row">
<div class="col-lg-4 catBox m-2 light-b-shadow">
<div class="cat">
<div class="cat__ear">
<div id="leftEar" class="cat__ear--left">
<div class="cat__ear--left-inside"></div>
</div>
<div id="rightEar" class="cat__ear--right">
<div class="cat__ear--right-inside"></div>
</div>
</div>
<div id="head" class="cat__head">
<div id="midDot" class="cat__head-dots">
<div id="leftDot" class="cat__head-dots_first"></div>
<div id="rightDot" class="cat__head-dots_second"></div>
</div>
<div class="cat__eye">
<div class="cat__eye--left">
<span class="pupil-left"></span>
</div>
<div class="cat__eye--right">
<span class="pupil-right"></span>
</div>
</div>
<div class="cat__nose"></div>
<div class="cat__mouth-contour"></div>
<div class="cat__mouth-left"></div>
<div class="cat__mouth-right"></div>
<div class="cat__whiskers-left"></div>
<div class="cat__whiskers-right"></div>
</div>
<div class="cat__body">
<div class="cat__chest"></div>
<div class="cat__chest_inner"></div>
<div class="cat__paw-left"></div>
<div class="cat__paw-left_inner"></div>
<div class="cat__paw-right"></div>
<div class="cat__paw-right_inner"></div>
<div id="tail" class="cat__tail"></div>
</div>
</div>
<br>
<div class="dnaDiv" id="catDNA">
<b>
DNA:
<!-- Colors -->
<span id="dnabody"></span>
<span id="dnamouth"></span>
<span id="dnaeyes"></span>
<span id="dnaears"></span>
<!-- Cattributes -->
<span id="dnashape"></span>
<span id="dnadecoration"></span>
<span id="dnadecorationMid"></span>
<span id="dnadecorationSides"></span>
<span id="dnaanimation"></span>
<span id="dnaspecial"></span>
</b>
</div>
</div>
<div class="col-lg-7 cattributes m-2 light-b-shadow">
<!-- Cat colors -->
<ul id="cattabs" class="nav nav-tabs" role="tablist">
<li class="nav-item" role="presentation">
<button type="button" id="catColorsTabButton" href="#catColorsTab" class="nav-link active" data-bs-target="#catColorsTab" aria-controls="catColorsTab" role="tab" data-bs-toggle="tab">Cat Colors</button>
</li>
<li class="nav-item active" role="presentation">
<button type="button"id="catAttributesTabButton" href="#catAttributesTab" class="nav-link" data-bs-target="#catAttributesTab" aria-controls="catAttributesTab" role="tab" data-bs-toggle="tab">Attributes</button>
</li>
</ul>
<div class="tab-content" id="catTabContent">
<div id="catColorsTab" role="tabpanel" class="tab-pane fade show active" aria-labelledby="catColorsTabButton">
<div class="form-group">
<label for="formControlRange"><b>Head and body</b><span class="badge badge-dark ml-2" id="headcode"></span></label>
<input type="range" min="10" max="98" class="form-control-range" id="bodycolor">
</div>
<div class="form-group">
<label for="formControlRange"><b>Mouth, Body and Tail</b><span class="badge badge-dark ml-2" id="mouthcode"></span></label>
<input type="range" min="10" max="98" class="form-control-range" id="mouthcolor">
</div>
<div class="form-group">
<label for="formControlRange"><b>Eyes</b><span class="badge badge-dark ml-2" id="eyecode"></span></label>
<input type="range" min="10" max="98" class="form-control-range" id="eyecolor">
</div>
<div class="form-group">
<label for="formControlRange"><b>Ears and Paws</b><span class="badge badge-dark ml-2" id="earcode"></span></label>
<input type="range" min="10" max="98" class="form-control-range" id="earcolor">
</div>
</div>
<div id="catAtrributesTab" role="tabpanel" class="tab-pane fade" aria-labelledby="catAttributesTabButton">
<div class="form-group">
<label for="formControlRange"><b>Eyes shape</b><span class="badge badge-dark ml-2" id="eyeName"></span></label>
<input type="range" min="1" max="7" class="form-control-range" id="eyeshape">
</div>
<div class="form-group">
<label for="formControlRange"><b>Decorative Patern</b><span class="badge badge-dark ml-2" id="decorationName"></span></label>
<input type="range" min="1" max="7" class="form-control-range" id="decorationpattern">
</div>
<div class="form-group">
<label for="formControlRange"><b>Decoration Mid Color</b><span class="badge badge-dark ml-2" id="midcolorcode"></span></label>
<input type="range" min="10" max="98" class="form-control-range" id="decorationmid">
</div>
<div class="form-group">
<label for="formControlRange"><b>Decoration Sides Color</b><span class="badge badge-dark ml-2" id="sidecolorcode"></span></label>
<input type="range" min="10" max="98" class="form-control-range" id="decorationsides">
</div>
<div class="form-group">
<label for="formControlRange"><b>Animation</b><span class="badge badge-dark ml-2" id="animationName"></span></label>
<input type="range" min="1" max="6" class="form-control-range" id="animation">
</div>
</div>
</div>
</div>
</div>
<br>
</div>
<footer align="left">
<p>Ivan on Tech Academy Bootcamp July 2020</p>
</footer>
<script type="text/javascript" src="assets/js/jquery-3.4.1.js"></script>
<script src="assets/bootstrap/js/popper.js"></script>
<script src="assets/bootstrap/js/bootstrap.min.js"></script>
<script src="assets/js/colors.js"></script>
<script src="assets/js/catSettings.js"></script>
<script src="assets/js/catFactory.js"></script>
</body>
</html>
Test code:
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<h1>Hello, world!</h1>
<ul class="nav nav-tabs" id="myTab" role="tablist">
<li class="nav-item" role="presentation">
<button class="nav-link active" id="home-tab" data-bs-toggle="tab" data-bs-target="#home" type="button" role="tab" aria-controls="home" aria-selected="true">
Home
</button>
</li>
<li class="nav-item" role="presentation">
<button class="nav-link" id="profile-tab" data-bs-toggle="tab" data-bs-target="#profile" type="button" role="tab" aria-controls="profile" aria-selected="false">
Profile
</button>
</li>
<li class="nav-item" role="presentation">
<button class="nav-link" id="contact-tab" data-bs-toggle="tab" data-bs-target="#contact"
type="button" role="tab" aria-controls="contact" aria-selected="false">
Contact
</button>
</li>
</ul>
<div class="tab-content" id="myTabContent">
<div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab">
Home Content
</div>
<div class="tab-pane fade" id="profile" role="tabpanel" aria-labelledby="profile-tab">
Profile Content
</div>
<div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab">
Contact Content
</div>
</div>
<!-- Optional JavaScript; choose one of the two! -->
<!-- Option 1: jQuery and Bootstrap Bundle (includes Popper) -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns" crossorigin="anonymous"></script>
<!-- Option 2: Separate Popper and Bootstrap JS -->
<!--
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js" integrity="sha384-+YQ4JLhjyBLPDQt//I+STsc9iw4uQqACwlvpslubQzn4u2UU2UFM80nGisd026JF" crossorigin="anonymous"></script>
-->
</body>
</html>