Horizontal line in a Jumbotron - html

I don't feel well. All of a sudden, an unwanted white horizontal line has appeared in the bottom of my jumbotron. It's happened after...
Inserting a navbar form
Adding a form at the bottom of the body
Inserting a object then
inserting a button in the jumbotron
I've commented out all changes I've made, but to no avail.
<header class="jumbotron">
<!-- Main component for a primary marketing message or call to action -->
<div class="container">
<div class="row row-content">
<div class="col-xs-12 col-sm-8">
<h1>Ristorante con Fusion</h1>
<p style="padding:40px;"></p>
<p>We take inspiration from the World's best cuisines!</p>
</div>
<div class="col-xs-12 col-sm-2">
<p style="padding:20px;"></p>
<img src="img/logo.png" class="img-responsive">
</div>
<div class="col-xs-12 col-sm-2">
<br><br><br><br><br>
<button type="button" class="btn btn-warning btn-lg btn-block" onclick="window.location.href='#reservation'">Reserve table</button>
</div>
</div>
</div>
</header>

<header class="jumbotron" style="margin-bottom:0px">
<!-- Main component for a primary marketing message or call to action -->
<div class="container">
<div class="row row-content">
<div class="col-xs-12 col-sm-8">
<h1>Ristorante con Fusion</h1>
<p style="padding:40px;"></p>
<p>We take inspiration from the World's best cuisines!</p>
</div>
<div class="col-xs-12 col-sm-2">
<p style="padding:20px;"></p>
<img src="img/logo.png" class="img-responsive">
</div>
<div class="col-xs-12 col-sm-2">
<br><br><br><br><br>
<button type="button" class="btn btn-warning btn-lg btn-block" onclick="window.location.href='#reservation'">Reserve table</button>
</div>
</div>
</div>

Found it! You can relax everyone...
<div class="row row-content">
should have been
<div class="row row-header">

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Why a row is stacked in column

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enter image description herehow to center all the elements center in the html body with responsive.i want all three elements in center of the body which are shown in the image.Am using bootstrap frame.
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enter image description here
Have a look at this - https://plnkr.co/edit/ABOpqjxWw2ZvGiMiy53O?p=preview
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Are you sure is syntax ok?
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Where is the " after src?
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