Enhance the Bootstrap parallelogram navbar menu by ensuring the menu items are perfectly aligned

I am working on customizing Bootstrap 5's navbar menu to create a rollover menu with parallelogram-shaped active menu items. I followed the approach recommended here, and while it works, the output is not as polished as I would like because the parallelogram-shaped menu items do not align perfectly.

When the active state is enabled for all of the menu items (in Firefox, but also noticeable in Chrome), this is how it appears:

https://i.sstatic.net/LKaXI.png

You can view a sample demonstrating the issue and containing all the relevant code in this CodePen.

For reference, here is the markup required, even though it is included in the CodePen:

.navbar {
  padding-top: 0;
}

.navbar-nav {
  display: table;
  width: 100%;
}

.navbar-nav>li {
  float: none;
  display: table-cell;
  text-align: center;
  transform: skewX(-40deg);
  -o-transform: skewX(-40deg);
  -moz-transform: skewX(-40deg);
  -webkit-transform: skewX(-40deg);
}

.navbar-nav>li span {
  display: inline-block;
  transform: skewX(40deg);
  -o-transform: skewX(40deg);
  -moz-transform: skewX(40deg);
  -webkit-transform: skewX(40deg);
}

.navbar-nav .show>.nav-link,
.navbar-nav .nav-link {
  color: #000;
  transition: all 350ms ease-out;
  -webkit-transition: all 350ms ease-out;
  -moz-transition: all 350ms ease-out;
  -o-transition: all 350ms ease-out;
}

.navbar-nav .active {
  color: #FFF;
  background: #000;
}

.navbar-nav .nav-link:hover {
  color: #FFF;
  background: #000;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.0.2/css/bootstrap.min.css" rel="stylesheet"/>
<nav class="navbar navbar-expand-lg collapsed" aria-label="Eighth navbar example">
  <div class="container">
    <a class="navbar-brand me-6 me-xl-7" href="#">Brand</a>
    <button class="navbar-toggler third-button" type="button" data-bs-toggle="collapse" data-bs-target="#navbar-home" aria-controls="navbarsExample07" aria-expanded="false" aria-label="Toggle navigation">
                <div class="animated-icon">
                    <span></span>
                    <span></span>
                    <span></span>
                </div>
            </button>

    <div class="collapse navbar-collapse" id="navbar-home">
      <ul class="navbar-nav mb-auto mb-2 my-0 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#"><span>Home</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link active" href="#"><span>Find My Car</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link active" href="#"><span>Frequently Asked Questions</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link active" href="#"><span>Testimonials</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link active" href="#"><span>Contact Us</span></a>
        </li>
      </ul>
    </div>
  </div>
</nav>

I need assistance resolving why my menu items are not aligning properly and how I can adjust them to be flush. Any suggestions?

Answer №1

It seems like the elements are 'flush' or next to each other in terms of CSS positioning. The issue you're witnessing is the varying white gaps between different items that change when the zoom level changes. This could be caused by part-pixels in CSS terms, where a CSS pixel can consist of multiple screen pixels leading to edge effects and rounding errors.

To workaround this issue, one slightly hacky solution is to add a pseudo element to each item that is 1px (CSS pixel) larger on all sides than the actual item, with the same color background. This helps disguise the edge effect. Below is the additional code snippet added to the existing code provided in the question's codepen:

.navbar-nav .active::before {
  content: '';
  background-color: #000;
  position: absolute;
  width: calc(100% + 2px);
  height: calc(100% + 2px);
  top: -1px;
  left: -1px;
  display: inline-block;
}

<html lang="en">

<head>

  <meta charset="UTF-8">

  // Additional meta tags and links here 

  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.0.2/css/bootstrap.min.css">

  <style>
    // Your existing styles here
  </style>

  // Scripts and other necessary elements

</head>

// Body content 

</body>

</html>

To validate the fix, run the snippet in full-page mode and adjust the zoom level to ensure there are no unwanted white lines separating the elements.

Answer №2

After careful consideration, I opted to tackle this issue using a different approach and then including margin-left:-2px. This new method seamlessly integrates with the Bootstrap navbar compared to the previous solution. The HTML markup remains unchanged, and below you'll find my CSS code:

@media (min-width: 992px) {

  .navbar-nav .nav-item .nav-link {
    padding-right: 0.3em;
    padding-left: 0.3em;
  }

  .navbar-nav {
    display:table; 
    width:100%;
  }

  .navbar li {
    display: table-cell;
  }

  .navbar-nav .nav-item {
    float: left;
    padding-right: 1em;
    padding-left: 1em;
    position: relative;
    cursor: pointer;
    margin-left: -2px;
  }

  .navbar-nav .nav-item::after {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    transform: skew(-45deg);
    transition: background-color 100ms ease-in-out, border-color 100ms ease-in-out;
  }

  .navbar-nav .nav-item .active::after {
    background-color: var(--bs-body-color);
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    transform: skew(-45deg);
    transition: background-color 100ms ease-in-out, border-color 100ms ease-in-out;
  }

  .navbar-nav .nav-item .nav-link {
    color: var(--bs-body-colour);
    transition: none;
  }

  .navbar-nav .nav-item .active,
  .navbar-nav .nav-item .nav-link:hover {
    color: var(--bs-body-bg);
  }

  .navbar-nav .nav-item:hover::after {
    background-color: var(--bs-body-color);
    color: var(--bs-body-bg);
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    transform: skew(-45deg);
    transition: background-color 100ms ease-in-out, border-color 100ms ease-in-out;
  }
}

I made sure to enclose everything within the md media query to ensure the styles apply only to larger devices, avoiding any interference with the navbar on smaller screens.

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