我想要在单击切换按钮时，导航栏“折叠”打开，页面其余部分的底部变为透明黑色。
怎么做？
这是我想要的一个例子：
https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_sidenav_push_opacity
以下是drupal模板的内容：
{#
/**
* @file
* Default theme implementation to display a single page.
*
* The doctype, html, head and body tags are not in this template. Instead they
* can be found in the html.html.twig template in this directory.
*
* Available variables:
*
* General utility variables:
* - base_path: The base URL path of the Drupal installation. Will usually be
* "/" unless you have installed Drupal in a sub-directory.
* - is_front: A flag indicating if the current page is the front page.
* - logged_in: A flag indicating if the user is registered and signed in.
* - is_admin: A flag indicating if the user has permission to access
* administration pages.
*
* Site identity:
* - front_page: The URL of the front page. Use this instead of base_path when
* linking to the front page. This includes the language domain or prefix.
*
* Navigation:
* - breadcrumb: The breadcrumb trail for the current page.
*
* Page content (in order of occurrence in the default page.html.twig):
* - title_prefix: Additional output populated by modules, intended to be
* displayed in front of the main title tag that appears in the template.
* - title: The page title, for use in the actual content.
* - title_suffix: Additional output populated by modules, intended to be
* displayed after the main title tag that appears in the template.
* - messages: Status and error messages. Should be displayed prominently.
* - tabs: Tabs linking to any sub-pages beneath the current page (e.g., the
* view and edit tabs when displaying a node).
* - action_links: Actions local to the page, such as "Add menu" on the menu
* administration interface.
* - node: Fully loaded node, if there is an automatically-loaded node
* associated with the page and the node ID is the second argument in the
* page's path (e.g. node/12345 and node/12345/revisions, but not
* comment/reply/12345).
*
* Regions:
* - page.header: Items for the header region.
* - page.navigation: Items for the navigation region.
* - page.navigation_collapsible: Items for the navigation (collapsible) region.
* - page.highlighted: Items for the highlighted content region.
* - page.help: Dynamic help text, mostly for admin pages.
* - page.content: The main content of the current page.
* - page.sidebar_first: Items for the first sidebar.
* - page.sidebar_second: Items for the second sidebar.
* - page.footer: Items for the footer region.
*
* @ingroup templates
*
* @see template_preprocess_page()
* @see html.html.twig
*/
#}
{% set container = theme.settings.fluid_container ? 'container-fluid' : 'container' %}
{# Navigation (collapsible) #}
{% if page.navigation_collapsible %}
<div id="navbar-collapse" class="navbar-collapse collapse width">
{{ page.navigation_collapsible }}
</div>
{% endif %}
{# Navbar #}
{% if page.navigation or page.navigation_collapsible %}
{% block navbar %}
{%
set navbar_classes = [
'navbar',
theme.settings.navbar_inverse ? 'navbar-inverse' : 'navbar-default',
theme.settings.navbar_position ? 'navbar-' ~ theme.settings.navbar_position|clean_class : container,
]
%}
<header{{ navbar_attributes.addClass(navbar_classes) }} id="navbar" role="banner">
{% if not navbar_attributes.hasClass(container) %}
<div class="{{ container }}">
{% endif %}
<div class="navbar-header">
{{ page.navigation }}
{# .btn-navbar is used as the toggle for collapsed navbar content #}
</div>
{% if not navbar_attributes.hasClass(container) %}
</div>
{% endif %}
</header>
{% endblock %}
{% endif %}
{# Main #}
{% block main %}
<div role="main" class="main-container {{ container }} js-quickedit-main-content">
<div class="row">
{# Header #}
{% if page.header %}
{% block header %}
<div class="col-sm-12" role="heading">
{{ page.header }}
</div>
{% endblock %}
{% endif %}
{# Sidebar First #}
{% if page.sidebar_first %}
{% block sidebar_first %}
<aside class="col-sm-3" role="complementary">
{{ page.sidebar_first }}
</aside>
{% endblock %}
{% endif %}
{# Content #}
{%
set content_classes = [
page.sidebar_first and page.sidebar_second ? 'col-sm-6',
page.sidebar_first and page.sidebar_second is empty ? 'col-md-9',
page.sidebar_second and page.sidebar_first is empty ? 'col-md-9',
page.sidebar_first is empty and page.sidebar_second is empty ? 'col-sm-12'
]
%}
<section{{ content_attributes.addClass(content_classes) }}>
{# Highlighted #}
{% if page.highlighted %}
{% block highlighted %}
<div class="highlighted">{{ page.highlighted }}</div>
{% endblock %}
{% endif %}
{# Breadcrumbs #}
{% if breadcrumb %}
{% block breadcrumb %}
{{ breadcrumb }}
{% endblock %}
{% endif %}
{# Action Links #}
{% if action_links %}
{% block action_links %}
<ul class="action-links">{{ action_links }}</ul>
{% endblock %}
{% endif %}
{# Help #}
{% if page.help %}
{% block help %}
{{ page.help }}
{% endblock %}
{% endif %}
{# Content #}
{% block content %}
<a id="main-content"></a>
{{ page.content }}
{% endblock %}
</section>
{# Sidebar Second #}
{% if page.sidebar_second %}
{% block sidebar_second %}
<aside class="col-md-3" role="complementary">
{{ page.sidebar_second }}
</aside>
{% endblock %}
{% endif %}
</div>
</div>
{% endblock %}
{% if page.footer %}
{% block footer %}
<footer class="footer {{ container }}" role="contentinfo">
{{ page.footer }}
</footer>
{% endblock %}
{% endif %}
导航菜单对应于此部分代码：
{# Navigation (collapsible) #}
{% if page.navigation_collapsible %}
<div id="navbar-collapse" class="navbar-collapse collapse width">
{{ page.navigation_collapsible }}
</div>
{% endif %}
答案 0 :(得分：0)
我已经检查了您的网站，您可以在样式表中使用此CSS。
#navbar-collapse > div {
position: absolute;
top: 0;
bottom: 0;
background: #fff;
z-index: 999;
width: 100%;
left: 0;
}
#navbar-collapse::after {
content: "";
position: fixed;
width: 100%;
height: 100%;
background: rgba(0,0,0,0.5);
left: 0;
top: 0;
z-index: 0;
}