Are you tired of haphazardly copying and pasting web design elements only to find they end up a the bottom of the page? Don't knock copy and paste; it's probably user error. Regardless, there's another way to create duplicate elements. Option-Drag on Mac or Alt-Drag on Windows, and let go wherever you want to place your element.
But it doesn't stop there. Not only does duplicating create a copy of the element. Oh, no. It brings over the class that was applied to the original element. That means styles can stay consistent between your original element and all the duplicated elements you can dream up.
This isn't just responsive web design. It's a magic trick. Except it's actually responsive web design. That feels like magic.