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<section> <div class="vid"> <iframe width="1280" height="720" src="//www.youtube.com/embed/ByOPXIHaVfQ" frameborder="0" allowfullscreen></iframe> </div> </section>
@import "nib" section width: 70% .vid margin: 2rem border: 30px solid red iframe width: 100% height: calc((70vw - 60px) * (9/16)) display: block
Also see: Tab Triggers