Install and activate Code Snippets plugin.
Go to Snippets > Add New.
Title: Add support for HTML5 markup
add_theme_support( 'html5', array( 'comment-list', 'comment-form', 'search-form', 'gallery', 'caption' ) );
Save and activate.
Add the following CSS.
A good place to add is Manage > Stylesheets in the Oxygen editor.
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