How can I remove this space between elements?

Question

Hello I working on my web project using bootstrap 3.3.7

Here is my HTML code example:

<nav class="navbar navbar-default nobottommargin" role="navigation">
    <div class="container-fluid">

        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-9">
                <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>

        <div class="collapse navbar-collapse" id="">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Home</a></li>
                <li><a href="#">Link</a></li>
                <li><a href="#">Link</a></li>
            </ul>
        </div>

    </div>
</nav>

<iframe src="https://www.news.sky.com" style="width:100%;height:100%" frameborder="3"></iframe>

And here is working JSFiddle.

As you can see in the example, there are some space between navbar and frame.

How can I remove this space? And how can I make iframe element close to navbar?

Answer 1

It's not good practice to change predefined bootstrap styles, even using !important.

You just need to set negative margin-top for iframe:

iframe {
   margin-top: -20px;
}

Answer 2

Need to remove margin-bottom of bootstrap with custom CSS

.nobottommargin {
  margin-bottom: 0px !important;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<nav class="navbar navbar-default nobottommargin" role="navigation">
  <div class="container-fluid">

    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-9">
        <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>

    <div class="collapse navbar-collapse" id="">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a>
        </li>
        <li><a href="#">Link</a>
        </li>
        <li><a href="#">Link</a>
        </li>
      </ul>
    </div>

  </div>
</nav>

<iframe src="https://www.news.sky.com" style="width:100%;height:100%" frameborder="3"></iframe>

Answer 3

In your fiddle you have added the class nobottommargin to your navbar, if you then add some custom CSS to your html as below you will see the margin disappears.

.nobottommargin {
    margin-bottom: 0px;
}

Answer 4

Nav tag has set bottom margin add to nav style margin-bottom: 0px and it's should work

<nav class="navbar navbar-default nobottommargin" role="navigation" style="margin-bottom: 0px">

Answer 5

Add this:

.navbar {
    margin-bottom: 0px !important;
}

Answer 6

.navbar has a margin-bottom: 20px;. Simply remove this with an own CSS class:

.nobottommargin {
  margin-bottom: 0;
}