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まだコードを試したことはありませんが、navbarと一緒に配置されたセンターnavbarブランドの単一のnavbarを持つことが可能かどうかを尋ねたかったので、 navbarは成長しなかった？ブートストラップ4 Navbar-Brand Vertical Alignment
私はナビゲーションバーの下に画像の下部を揃えたいと思います：
#hdrContainer {
background-color: #0a3782;
}
.container {
background-color: inherit;
}
#tblHeader {
width: 100%;
/*font-size: .8125rem;*/
font-size: 1rem;
text-align: right;
color: #ffffff;
font-weight: bold;
}
#tblHeader tr {
height: 50px;
}
.breadcrumb {
background-color: inherit;
margin-bottom: initial;
font-weight: bold;
}
.breadcrumb .active {
color: inherit;
}
#socialbrand {
text-align: right;
}
#mainNavbar {
background-color: gray;
}
#mainNavbar .container .navbar {
position: relative;
z-index: 0;
max-height: 40px;
}
.navbar-brand {
position: relative;
z-index: 1;
margin-right: initial;
}
.form-control {
width: 200px;
}
.btn-outline-navy {
color: #f6b40e;
background-color: transparent;
background-image: none;
border-color: #f6b40e;
}
body {}<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" rel="stylesheet"/>
<body>
<div id="hdrContainer" class="container-fluid">
<div class="container">
<table id="tblHeader">
<tbody>
<tr>
<td>
<nav aria-label="breadcrumb" role="navigation">
<ol class="breadcrumb">
<li class="breadcrumb-item active" aria-current="page">Commander, Naval Surface Force, US Pacific</li>
</ol>
</nav>
</td>
<td id="socialbrand" style="display: block; padding: .75rem 1rem;">Follow Us |
<i class="fa fa-facebook-square" aria-hidden="true"></i>
<i class="fa fa-twitter-square" aria-hidden="true"></i>
<i class="fa fa-flickr" aria-hidden="true"></i>
<i class="fa fa-wordpress" aria-hidden="true"></i>
<i class="fa fa-youtube-square" aria-hidden="true"></i>
</td>
</tr>
<tr>
<td colspan="2">
<nav class="navbar navbar-light">
<form class="form-inline">
<input class="form-control form-control-sm ml-auto mr-sm-2 float-right" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-sm btn-outline-navy my-2 my-sm-0" type="submit">Search</button>
</form>
</nav>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="mainNavbar" class="container-fluid">
<div class="container">
<nav class="navbar navbar-expand-lg navbar-light">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav ml-auto mr-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="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<!-- Just an image -->
<a class="navbar-brand mr-auto ml-auto" href="#">
<img src="https://getbootstrap.com/assets/brand/bootstrap-solid.svg" width="75" height="75" alt="">
</a>
<ul class="navbar-nav ml-auto mr-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="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown1" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown1">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
</div>
</nav>
</div>
</div>
</body>
修正するには[this]（https://getbootstrap.com/docs/4.0/components/navbar/#placement）を参照してください。 – Klooven
@Klooven：ありがとう。しかし、私は、誰もが私の主な問題は、navbarブランドとその親の底辺との一番下のアライメントであるという事実を飛ばしているようだと思います。実際には – TroyPilewski