Bootstrap navbar-fixed-top is experiencing issues with background gradients not displaying properly

Why are background gradients not working with Bootstrap 3.0 navbar-fixed-top or bottom, only default?

html, body
{
    height: auto;
    width: 100%;
    overflow-x: hidden;
}

body
{
    background: #000000; /* fallback for old browsers */
    background: -webkit-linear-gradient(270deg, #000000 , #434343); /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(270deg, #000000 , #434343); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
        
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<!--  Navigation  -->
<nav class="navbar navbar-default navbar-fixed-bottom">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Separated link</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
      <form class="navbar-form navbar-left">
        <div class="form-group">
          <input type="text" class="form-control" placeholder="Search">
        </div>
        <button type="submit" class="btn btn-default">Submit</button>
      </form>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Separated link</a></li>
          </ul>
        </li>
      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>

Encountering an "invalid property Value" error in the DOM when using the classes navbar-fixed-bottom or navbar-fixed-top. Any ideas on why the page appears blank upon this error?

Take a look at the codepen for reference: http://codepen.io/Xociety/pen/jAgoWR

Answer №1

One possible explanation for this phenomenon is attributed to the use of height: auto; in your code.

By setting the body's height to be calculated automatically by the browser, adding navbar-fixed-bottom, with its fixed positioning, could result in the navbar's height not affecting the body's height. This may lead the browser to interpret a height of 0 and consequently prevent the gradient from being displayed.

However, modifying the CSS rule from height: auto; to height: 100%; can rectify this issue. By specifying that you want the body's height to be 100% of the html, the gradient will then be visible as the body will be displayed accordingly.

Answer №2

Here's an alternative approach:

.navbar-fixed-bottom, .navbar-fixed-top
{
    display: static;
}

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