Tips for eliminating the margin in a bootstrap navigation bar when hovering?

Here is the Navigation Bar that I customized, along with the CSS code I used to override the Bootstrap styling. Below are images showing the current output and the expected output.

<div class="row fixed-top">
<div class="col-md-1"></div>
<div class="col-md-10 padding">
    <nav class="navbar navbar-expand-lg  navbar-light bg-light">
        <span class="navbar-brand" >MySite</span>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarMain" 
                aria-controls="navbarMain" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

<div class="collapse navbar-collapse justify-content-end" id="navbarMain">
            <div class="navbar-nav float-lg-right">
                <a class="nav-item nav-link" href="#">Home</a>
                <a class="nav-item nav-link" ref="#services">Services</a>
                <a class="nav-item nav-link" href="#ourwork">Our Work</a>
                <a class="nav-item nav-link" href="#about">About Us</a>
                <a class="nav-item nav-link"href="#contact">ContactUs</a>
            </div>                   
        </div>
    </nav>
    </div>
<div class="col-md-1"></div>
</div>

The CSS code I applied:

 nav a:hover{
 background-color: green;
 text-decoration: none;
 margin: 0 0 0 0 !important;
 }

nav a:focus{
color: black;
}

.collapse{
margin: 0;
}

Current Output Image:

Expected Output Image:

Answer №1

If you want to achieve the desired output, simply include 2 rules to nav a:hover like this:

margin-top: -8px;
padding-top: 16px;

I have also removed both instances of

<div class="col-md-1"></div>
and replaced them with a single offset-md-1 class for better readability.

Check out the complete snippet below:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<style>
nav a:hover{
    background-color: green;
    text-decoration: none;
    margin-top: -8px;
    padding-top: 16px;
}

nav a:focus{
    color: black;
}

.collapse{
    margin: 0;
}
</style>

<div class="row fixed-top">
    <div class="col-md-10 offset-md-1 padding">
        <nav class="navbar navbar-expand-lg  navbar-light bg-light">
            <span class="navbar-brand" >MySite</span>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarMain" 
                    aria-controls="navbarMain" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse justify-content-end" id="navbarMain">
                <div class="navbar-nav float-lg-right">
                    <a class="nav-item nav-link" href="#">Home</a>
                    <a class="nav-item nav-link" ref="#services">Services</a>
                    <a class="nav-item nav-link" href="#ourwork">Our Work</a>
                    <a class="nav-item nav-link" href="#about">About Us</a>
                    <a class="nav-item nav-link"href="#contact">ContactUs</a>
                </div>                   
            </div>
        </nav>
    </div>
</div>

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

Answer №2

For more information on margins, paddings, and the box model, check out this article: https://www.sitepoint.com/set-css-margins-padding-cool-layout-tricks/

If my understanding is correct, you're aiming for a solid green background without any white space at the top of your page.

To address your issue, the CSS you applied targeted the links themselves rather than their parent elements that control spacing, which is why it didn't produce the desired effect.

You have two options to fix this:
1) Remove the padding-top property from .navbar directly

.navbar {
    padding-top: 0;
} 

2) Offset the padding-top property of .navbar by using a negative margin-top value on #navbarMain

#navbarMain {
    margin-top: -.5rem;
}  

The specific value of -.5rem may vary based on your setup, but that's the default in Bootstrap 4 as far as I'm aware.

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