Get rid of the white line in the Navbar-toggler when it expands

I'm trying to get rid of an odd white line that keeps appearing at the bottom of my header's navbar. The navbar has a dark background, but whenever I click on the toggler button, this strange white line shows up at the bottom.

You can view my webpage at this link:

abdelp.github.io

In the image below, I've pointed out the elusive line that I am unable to trace back and want to remove:

https://i.sstatic.net/dqex5.png

The HTML index only consists of the Bootstrap initial template and the navbar template.

<!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/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e5878a8a919691978495a5d1cbd0cbd6">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
    <link rel="stylesheet" href="/css/style.css">
    <title>Hello, world!</title>
  </head>

  <body>
    <header class="header">
      <nav class="navbar navbar-expand-lg">
        <a class="navbar-brand" href="#">Abdel Pérez</a>
        <button class="navbar-toggler navbar-dark" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarNav">
          <ul class="navbar-nav ml-auto">
            <li class="nav-item active">
              <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">Features</a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">Pricing</a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
            </li>
          </ul>
        </div>
      </nav>
    </header>

    <section class="site-banner site-banner--dark">
      <div class="site-banner__inner anim anim-up anim-fade loaded">
        <div class="site-banner__content">
          <h1 class="site-banner__title">
            My Projects
          </h1>
        </div>
      </div>
    </section>

    <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/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b9dbd6d6cdcacdcbd8c9f98d978c978a">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script>
  </body>
</html>
   

Here is the CSS code for the header:

/* Header */

.header {
  background-color: #191a1d;
}

.site-banner--dark {
  padding-bottom: 50px;
  -webkit-clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 50px));
  border-bottom: none;
  background-color: #191a1d;
}

.site-banner--dark .site-banner__title {
  color: #fff;
}

.site-banner--dark .site-banner__tagline,
.site-banner--dark .site-banner__subtitle {
  color: #ababab;
}

Answer №1

Here is my personal take on the issue along with the solution I arrived at:

It seems like this issue is closely related to the rendering engine of the browser, which can be considered a sort of bug, albeit a partial one.

  • I've come across similar situations in various browsers when working with SVG scales.
  • To resolve this issue, overlaying the two elements yields excellent results.
  • Instead of directly intersecting the two elements, nesting them 1px within each other works effectively.
  • In the CSS section of the snippet, I have indicated the necessary adjustments with /* Added */.
  • If you wish, you can test the smoothness of the animation by running the snippet.

Good luck with your project!

/* Header */

.header {
  background-color: #191a1d;
}

.site-banner--dark {
  /* Added */ margin-top: -1px;
  /* Added */ padding-top: 1px;
  padding-bottom: 50px;
  -webkit-clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 50px));
}

.site-banner--dark {
  border-bottom: none;
  background-color: #191a1d;
}

.site-banner--dark .site-banner__title {
  color: #fff;
}

.site-banner--dark .site-banner__tagline,
.site-banner--dark .site-banner__subtitle {
  color: #ababab;
}
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c8aaa7a7bcbbbcbaa9b888fce6fde6fb">[email protected]</a>/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">

<header class="header">
  <nav class="navbar navbar-expand-lg">
    <a class="navbar-brand" href="#">Abdel Pérez</a>
    <button class="navbar-toggler navbar-dark" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav ml-auto">
        <li class="nav-item active">
          <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Features</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Pricing</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
        </li>
      </ul>
    </div>
  </nav>
</header>

<section class="site-banner site-banner--dark">
  <div class="site-banner__inner anim anim-up anim-fade loaded">
    <div class="site-banner__content">
      <h1 class="site-banner__title">
        My Projects
      </h1>
      <h2 class="site-banner__sutitle">
        <!-- For over 10 years I’ve been designing and developing websites. Below are some of my favourites. -->
      </h2>
    </div>
  </div>
</section>

<!-- 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+lbbVYinv+OrCXyaRkfj" crossorigin="anonymous"></script>

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