<?xml version="1.0" encoding="UTF-8"?>
    <page_layouts xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:framework:View/PageLayout/etc/layouts.xsd">
        <layout id="myfullwidth">
            <label translate="true">Full Width Layout</label>
        </layout>
    </page_layouts>

<?xml version="1.0"?>
<layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_layout.xsd">
    <update handle="empty"/>
    <referenceContainer name="page.wrapper">
        <container name="header.container" as="header_container" label="Page Header Container"  htmlTag="header" htmlClass="page-header" before="main.content"/>
        <container name="page.top" as="page_top" label="After Page Header" after="header.container"/>
        <container name="footer-container" as="footer" before="before.body.end" label="Page Footer Container" htmlTag="footer" htmlClass="page-footer" />
    </referenceContainer>
</layout>