Use the theme’s [responsive-box] shortcode to insert videos/iframes and make them responsive.

This post tests WordPress’ Twitter Embeds feature.

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.