Layout overview
Your view will need extend the base.html.twig layout
{% extends '@pulsar/layouts/base.html.twig' %}
@pulsar is a variable that Jadu products need to define in their Twig bootstrap/constructor via the $loader->addPath() method. See http://twig.sensiolabs.org/doc/api.html#built-in-loaders.
Tabs
Tab views will need to extend the tabs component
{% extends "@pulsar/pulsar/components/tab.html.twig" %}
They can then populate the content blocks which make up a tab, an example tab view looks like this:
{% extends "@pulsar/pulsar/components/tab.html.twig" %}
{%- block actions_left -%}
  Actions bar items that are positioned on the left, like the html.actions_menu helper
{%- endblock actions_left -%}
{%- block actions_right -%}
  Actions bar items that are positioned on the right, like primary UI actions
{%- endblock actions_left -%}
{%- block tab_content -%}
  The main content of a tab goes here
{% endblock tab_content %}
{%- block tab_sidebar -%}
  Sidebar help text goes here
{%- endblock tab_sidebar -%}
Example DOM outline
To help troubleshoot layout issues, this is the expected outline of the DOM for most UI cases within a Pulsar UI.
<!DOCTYPE html>
<html class="no-js">
<head><!-- ... --></head>
<body class="language-html">
    <div role="main" class="container">
        <div class="inner-wrapper">
            <nav class="nav-main"><!-- ... --></nav>
            <div class="toolbar"><!-- ... --></div>
            <div class="sticky-container">
                <form class="main-search"><!-- ... --></form>
                <div class="content-main">
                    <div class="tabs__content">
                        <h1 class="main-title">Title</h1>
                        <div class="nav-inline"><!-- ... --></div>
                        <div class="tab__pane is-active">
                            <div class="actionsbar">
                                <div class="float--left"><!-- ... --></div>
                                <div class="float--right"><!-- ... --></div>
                            </div>
                            <div class="tab__container">
                                <div class="tab__inner">
                                    <div class="tab__content"><!-- ... --></div>
                                    <div class="tab__sidebar"><!-- ... --></div>
                                </div><!-- /.tab__inner -->
                            </div><!-- /.tab__container -->
                        </div><!-- /.tab__pane -->
                    </div><!-- /.tabs__content -->
                </div><!-- /.content-main -->
                <div class="tab-help-container t-tab-help-container">
                    <div class="tab-help"></div>
                </div>
            </div><!-- /.sticky-container -->
        </div><!-- /.inner-wrapper -->
    </div><!-- /.container -->
</body>
</html>