我想移动右上角的菜单图标按钮。但它出现在标题下。我应该添加什么样的属性或属性?
<!-- 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">
<!-- Title -->
<span class="mdl-layout-title">Title</span>
</div>
<!-- Right aligned menu below button -->
<button id="demo-menu-lower-right"
class="mdl-button mdl-js-button mdl-button--icon">
<i class="material-icons">more_vert</i>
</button>
<ul class="mdl-menu mdl-menu--bottom-right mdl-js-menu mdl-js-ripple-effect"
for="demo-menu-lower-right">
<li class="mdl-menu__item">Some Action</li>
<li class="mdl-menu__item">Another Action</li>
<li disabled class="mdl-menu__item">Disabled Action</li>
<li class="mdl-menu__item">Yet Another Action</li>
</ul>
<!-- Tabs -->
<div 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>
<a href="#fixed-tab-4" class="mdl-layout__tab">Tab 4</a>
</div>
</header>