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HTML

              
                <nav class="navbar navbar-dark bg-dark" aria-label="First navbar example">
<div class="container-fluid">
<a class="navbar-brand" href="#">BOOTSTRAP 5</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarsExample01" aria-controls="navbarsExample01" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon red"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExample01">
<ul class="navbar-nav me-auto mb-2">
<li class="nav-item"><a class="nav-link" href="#">Hund</a></li>
<li class="nav-item"><a class="nav-link" href="#">Katze</a></li>
<li class="nav-item"><a class="nav-link" href="#">Maus</a></li>
<li class="nav-item"><a class="nav-link" href="#">Vogel</a></li>
</ul>
</div>
</div>
</nav>

<div class="px-4 pt-2 my-5 text-center">
<img class="d-block mx-auto mb-4" src="https://getbootstrap.com/docs/5.0/assets/brand/bootstrap-logo.svg" alt="" width="72" height="57">
<h1 class="display-3 fw-bold">Bootstrap 5</h1>
<div class="col-lg-6 mx-auto">
<p class="lead mb-1">Get started with <a href="https://getbootstrap.com">Bootstrap</a>, the world’s most popular framework for building responsive, mobile-first sites.</p>
</div>
</div>

<div class="divider"></div>

<div class="container col-xxl-8 px-4 pt-2 my-5">
<div class="row flex-lg-row-reverse align-items-center g-5 py-5">
<div class="col-10 col-sm-8 col-lg-6">
<img src="https://getbootstrap.com/docs/5.0/examples/heroes/bootstrap-themes.png" class="d-block mx-lg-auto img-fluid" alt="Bootstrap Themes" width="700" height="500" loading="lazy">
</div>
<section class="col-lg-6">
<h2 class="display-5 fw-bold"><i class="fab fa-css3 fa-spin"></i> CSS Framework.</h2>
<p class="lead">Quickly design and <em>customize</em> responsive mobile-first <a href="#">sites</a> with Bootstrap, the world’s most popular front-end open source toolkit, featuring Sass variables and mixins, responsive <strong>grid</strong> system, extensive prebuilt components, and powerful JavaScript plugins.</p>
<p><span class="badge bg-primary">Primary</span>
<span class="badge bg-secondary">Secondary</span>
<span class="badge bg-success">Success</span>
<span class="badge bg-danger">Danger</span><br>
<span class="badge bg-warning text-dark">Warning</span>
<span class="badge bg-info text-dark">Info</span>
<span class="badge bg-light text-dark">Light</span>
<span class="badge bg-dark">Dark</span></p>
</section>
</div>
</div>

<div class="divider"></div>

<section class="px-4 pt-4 text-center">
<h2 class="display-4 fw-bold">Portfolio</h2>
<div class="col-lg-6 mx-auto">
<p class="lead mb-4">Quickly design and customize responsive mobile-first sites with Bootstrap, the world’s most popular front-end open source toolkit, featuring Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful JavaScript plugins.</p>
<div class="d-grid gap-2 d-sm-flex justify-content-sm-center mb-5">
<button type="button" class="btn btn-primary btn-lg px-4 me-sm-3">Primary</button>
<button type="button" class="btn btn-outline-secondary btn-lg px-4">Secondary</button>
</div>
</div>
<div class="overflow-hidden" style="max-height: 30vh;">
<div class="container px-5">
<img src="https://getbootstrap.com/docs/5.0/examples/heroes/bootstrap-docs.png" class="img-fluid border rounded-3 shadow-lg mb-4" alt="Example image" width="700" height="500" loading="lazy">
</div>
</div>
</section>

<div class="divider"></div>

<div class="container col-xl-10 col-xxl-8 pt-2">
<div class="row align-items-center g-5 py-5">
<section class="col-lg-7 text-center text-lg-start">
<h2 class="display-4 fw-bold lh-1 mb-3">Feedback</h2>
<p class="lead col-lg-10">Below is an example form built entirely with Bootstrap’s form controls. Each required form group has a validation state that can be triggered by attempting to submit the form without completing it.</p>
<div class="btn-group" role="group" aria-label="Basic mixed styles example">
<button type="button" class="btn btn-dark">B</button>
<button type="button" class="btn btn-danger">R</button>
<button type="button" class="btn btn-warning">D</button>
</div>
</section>
<div class="col-10 mx-auto col-lg-5">
<form class="p-5 border rounded-3 bg-light">
<div class="form-floating mb-3">
<input type="email" class="form-control" id="floatingInput" placeholder="name@example.com">
<label for="floatingInput">Name</label>
</div>
<div class="form-floating mb-3">
<input type="password" class="form-control" id="floatingPassword" placeholder="Password">
<label for="floatingPassword">Nachricht</label>
</div>
<button class="w-100 btn btn-lg btn-primary" type="submit">Abschicken</button>
</form>
</div>
</div>
</div>

<div class="divider"></div>

<div class="container">
<div class="d-flex justify-content-center py-3">
<ul class="nav nav-pills">
<li class="nav-item"><a href="#" class="nav-link">Hund</a></li>
<li class="nav-item"><a href="#" class="nav-link">Katze</a></li>
<li class="nav-item"><a href="#" class="nav-link">Maus</a></li>
<li class="nav-item"><a href="#" class="nav-link">Vogel</a></li>
</ul>
</div>
</div>

<div class="divider"></div>

<div class="container my-5">
<div class="row p-4 pb-0 pe-lg-0 pt-lg-5 align-items-center rounded-3 border shadow-lg">
<section class="col-lg-7 p-3 p-lg-5 pt-lg-3">
<h2 class="display-4 fw-bold lh-1">Border hero with cropped image and shadows</h2>
<p class="lead">Quickly design and customize responsive mobile-first sites with Bootstrap, the world’s most popular front-end open source toolkit, featuring Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful JavaScript plugins.</p>
<div class="d-grid gap-2 d-md-flex justify-content-md-start mb-4 mb-lg-3">
<button type="button" class="btn btn-primary btn-lg px-4 me-md-2 fw-bold">Primary</button>
<button type="button" class="btn btn-outline-secondary btn-lg px-4">Default</button>
</div>
</section>
<div class="col-lg-4 offset-lg-1 p-0 position-relative overflow-hidden shadow-lg">
<div class="position-lg-absolute top-0 left-0 overflow-hidden">
<img class="d-block rounded-lg-3" src="https://getbootstrap.com/docs/5.0/examples/heroes/bootstrap-docs.png" alt="" width="720">
</div>
</div>
</div>
</div>

<div class="divider"></div>

<div class="container px-4 pt-2 my-5">
<div class="row p-2 pb-0 pe-lg-0 align-items-center rounded-3 border shadow-lg">
<nav aria-label="breadcrumb">
<ol class="breadcrumb">
<li class="breadcrumb-item"><a href="#">Start</a></li>
<li class="breadcrumb-item"><a href="#">Kategorie</a></li>
<li class="breadcrumb-item active" aria-current="page">Section</li>
</ol>
</nav>
<h2 class="display-4 fw-bold lh-1 mb-3">Section</h2><hr>
	<p class="lead">Siehe dir den <span class="badge bg-secondary">badge</span> <code>Quelltext</code> an, was hier für ein Aufriss gemacht wird, damit diese Box hier so Aussieht, wie sie Aussieht.</p>
</div>
</div>

<div class="divider"></div>

<div class="container px-4 pt-2 my-5">
<div class="row py-5">
	
<aside class="col-md-4"><div class="card">
<img src="https://unsplash.it/410" class="card-img-top" alt="...">
<div class="card-body">
<h3 class="card-title">Box 1</h3>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
<button type="button" class="btn btn-primary" data-bs-toggle="tooltip" data-bs-placement="right" title="Info">Hover me</button>
</div>
</div>
</aside>
	
<aside class="col-md-4"><div class="card">
<img src="https://unsplash.it/420" class="card-img-top" alt="...">
<div class="card-body">
<h3 class="card-title">Box 2</h3>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
<button type="button" class="btn btn-primary" data-bs-toggle="tooltip" data-bs-placement="right" title="Info">Hover me</button>
</div>
</div>
</aside>
	
<aside class="col-md-4"><div class="card">
<img src="https://unsplash.it/430" class="card-img-top" alt="...">
<div class="card-body">
<h3 class="card-title">Box 3</h3>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>	
<button type="button" class="btn btn-primary" data-bs-toggle="tooltip" data-bs-placement="right" title="Info">Hover me</button>
</div>
</div>
</aside>
	
</div>
</div>

<footer class="bg-dark p-4 text-white text-center">
<nav class="nav d-flex justify-content-between">
<a class="p-2 link-secondary" href="#">World</a>
<a class="p-2 link-secondary" href="#">U.S.</a>
<a class="p-2 link-secondary" href="#">Technology</a>
<a class="p-2 link-secondary" href="#">Design</a>
<a class="p-2 link-secondary" href="#">Culture</a>
<a class="p-2 link-secondary" href="#">Business</a>
<a class="p-2 link-secondary" href="#">Top</a>
</nav>
</footer>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js" integrity="sha384-JEW9xMcG8R+pH31jmWH6WWP0WintQrMb4s7ZOdauHnUtxwoG2vI5DkLtS3qm9Ekf" crossorigin="anonymous"></script>
              
            
!

CSS

              
                @import url(https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css);
@import url(https://use.fontawesome.com/releases/v5.15.3/css/all.css);
@import url(https://fonts.googleapis.com/css?family=Poiret+One|Anton|Roboto:100,400);

h1, h2, h3 { 
	font-family: 'Poiret One'; 
	font-size: calc(1.2rem + 1.4vmin);
	font-weight: bold; 
}

a { 
	text-decoration: none; 
}

.navbar-toggler:focus {
  box-shadow: none;
}
.navbar-toggler {
  border: 0;
}

.divider {
height: 3rem;
background-color: rgba(0, 0, 0, .1);
border: solid rgba(0, 0, 0, .15);
border-width: 1px 0;
box-shadow: inset 0 .5em 1.5em rgba(0, 0, 0, .1), inset 0 .125em .5em rgba(0, 0, 0, .15);
}
              
            
!

JS

              
                // tooltip
var tooltipTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="tooltip"]'))
var tooltipList = tooltipTriggerList.map(function (tooltipTriggerEl) {
  return new bootstrap.Tooltip(tooltipTriggerEl)
})
              
            
!
999px

Console