The visibility of the Bootstrap 4 collapse button seems to be missing

I am currently working on optimizing the responsiveness of my navigation bar. However, I encountered an issue where the button that collapses the nav bar is not visible when I resize my browser for testing purposes. Even after attempting to set a dark background for the nav bar, the button remains invisible.

Here is the snippet of my HTML:

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <title>Cuppela</title>
    <script src="js/jquery.min.js" type="text/javascript"></script>
    <script src="js/bootstrap.min.js" type="text/javascript"></script>
    <script src="js/popper.min.js" type="text/javascript"></script>
    <link rel="stylesheet" href="css/bootstrap.min.css" type="text/css">
    <link rel="stylesheet" href="css/test.css" type="text/css">
</head>
<body>

<div id="nav-menu">
    <nav id="main-nav" class="navbar navbar-expand-md fixed-top">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
            <span class="navbar-toggler-icon"></span>
          </button>
          <div class="collapse navbar-collapse" id="collapsibleNavbar">
            <ul class="nav navbar-nav mx-auto">
                <li class="nav-item">
                    <a class="nav-link" href="#">Home</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Shop</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">About</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Contact</a>
                </li>
            </ul>
        </div>
    </nav>
</div>
<div class="container-fluid" id="top-main"> 

    <div id="top_text">
        <h1>Cuppela Made With Sugar</h1>
        <p style="font-size: x-large;">Delicious Homemade Cakes</p>
    </div>
    
</div>

<div id="best-sellers "class="container">
    <h2>Best Sellers</h2>
    <hr>
    <div id="best-seller-cakes" class="row">
        <div class="col-xs-12 col-sm-6 col-lg-3">
            <img src="images/chocolate_cake.jpg">
            <h4>Good<br>Cakes</h4>
            <p>Delicious Cake with Awesome Goodness</p>
        </div>
        <div class="col-xs-12 col-sm-6 col-lg-3">
            <img src="images/red_velvet_cake.jpeg">
            <h4>Awesome<br>Cakes</h4>
            <p>Delicious Cake with Awesome Goodness</p>
        </div>
        <div class="col-xs-12 col-sm-6 col-lg-3">
            <img src="images/strawberry_cake.jpg">
            <h4>Great<br>Cakes</h4>
            <p>Delicious Cake with Awesome Goodness</p>
        </div>
        <div class="col-xs-12 col-sm-6 col-lg-3">
            <img src="images/cake_seven.jpg">
            <h4>Delicious<br>Cakes</h4>
            <p>Delicious Cake with Awesome Goodness</p>
        </div>
    </div>
</div>

</body>
</html>

This is the portion of my CSS styling:

body{
    margin: 0px;
}

li a:hover {
    background-color: #ff9900;
    border-radius: 10px;
}

li a{
    color: white !important;
}

.nav-link{
    padding: 0 0 .2rem
}

#top-main{
    background-image: url(../images/cake_six_two.jpg);
    height: 100vh;
}

#nav-menu{
    font-size: medium;
    position: relative;
}

#top_text{
    color: white;
    text-align: center;
    position: relative;
    top: 50%;
    left: 50%;
    /* bring your own prefixes */
    transform: translate(-50%, -50%);
}

h1{
    font-size: 500%;
    text-align: center;
}


h2{
    text-align: center;
}

#best-sellers{
    text-align: center;
}

#best-seller-cakes{
    text-align: center;
}

h4
{
    font-size: x-large;
    font-weight: bold;
    font-family: Georgia, 'Times New Roman', Times, serif;
}

Please note that the original webpage link has been removed as it is no longer accessible.

Answer №1

Issue identified - There seems to be a problem with your HTML code. Include the following two classes in the <nav> </nav> element in your HTML for more information, refer to the bootstrap documentation.

navbar-dark bg-dark

Alternatively, you can use the following code snippet -

 <nav id="main-nav" class="navbar navbar-expand-md fixed-top navbar-dark bg-dark">

By adjusting these classes or customizing their properties, you can modify the functionality. Remember not to override bootstrap classes directly, instead add your own classes to customize the CSS properties as needed

Answer №2

Include the following CSS class: navbar-dark bg-transparent

<nav id="main-nav" class="navbar navbar-expand-md fixed-top navbar-dark bg-transparent">

Answer №3

Looks like the culprit is hiding in a css file named _transitions.scss

Upon careful inspection of your code, I noticed a rule that hides the navbar by setting its display property to none when the width goes below 750 pixels.

You may want to investigate this file and consider either adjusting it to make your navbar more compact or removing the problematic code altogether.

In particular, the following snippet is responsible for causing your navbar to disappear during resizing:

.collapse {
  &:not(.show) {
    display: none;
  }
}

Answer №4

The reason why the collapse button is not visible is because transparent background and border css are applied to it.

To fix this issue, go to line number 109 in the _navbar.scss file where you will find the following CSS:

.navbar-toggler {
    padding: .25rem .75rem;
    font-size: 1.25rem;
    line-height: 1;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: .25rem;
} 

To make the collapse button visible, simply change background-color: transparent; to background-color: white;

.navbar-toggler {
    padding: .25rem .75rem;
    font-size: 1.25rem;
    line-height: 1;
    background-color: transparent;
    border: 1px solid white;
    border-radius: .25rem;
}

By making this adjustment, your issue should be resolved. Thank you for bringing this to our attention.

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