Simple set of Sass mixin and function to quickly convert pixels to rems.
This solution assumes that baseline is 10px, you can override that easily
by changing the baseline-px value in the _remify.scss.
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Quick, one-off pixels to rem value conversion
font-size: remify(12px);
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Converting entire property
margin-right: remify(0 20px 20px 0);
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Converting entire property with a pixel fallback for older browsers
@include rem('margin-right', 0 20px 20px 0);