我正在尝试构建一个基于MDL的标头，其中包括抽屉和标签。问题是这两个组件出现在不同的行上，而我希望它们在同一行上。
http://codepen.io/anon/pen/KVWppQ
<html>
<head>
<!-- Material Design Lite -->
<script src="https://storage.googleapis.com/code.getmdl.io/1.0.6/material.min.js"></script>
<link rel="stylesheet" href="https://storage.googleapis.com/code.getmdl.io/1.0.6/material.indigo-pink.min.css">
<!-- Material Design icon font -->
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>
<body>
<!-- Simple header with fixed tabs. -->
<div class="mdl-layout mdl-js-layout mdl-layout--fixed-header
mdl-layout--fixed-tabs">
<header class="mdl-layout__header">
<div class="mdl-layout__header-row">
<div class="mdl-layout-spacer"></div>
</div>
<!-- Tabs -->
<nav class="mdl-layout__tab-bar mdl-js-ripple-effect">
<a href="#fixed-tab-1" class="mdl-layout__tab is-active">Tab 1</a>
<a href="#fixed-tab-2" class="mdl-layout__tab">Tab 2</a>
<a href="#fixed-tab-3" class="mdl-layout__tab">Tab 3</a>
</nav>
</header>
<div class="mdl-layout__drawer">
<span class="mdl-layout-title">Title</span>
</div>
<main class="mdl-layout__content">
<section class="mdl-layout__tab-panel is-active" id="fixed-tab-1">
<div class="page-content"><!-- Your content goes here --></div>
</section>
<section class="mdl-layout__tab-panel" id="fixed-tab-2">
<div class="page-content"><!-- Your content goes here --></div>
</section>
<section class="mdl-layout__tab-panel" id="fixed-tab-3">
<div class="page-content"><!-- Your content goes here --></div>
</section>
</main>
</div>
</body>
</html>
提前致谢！