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rem() is a Sass mixin that converts pixel values to rem values for whatever property is passed to it. It returns two lines of code — one of the regular pixel values (for some older browsers), and another with the converted rem values (for everyone else). Special thanks to Chris Epstein ( and Martin Bavio ( for the help and code!

Sample input:

.element {
  @include rem('padding',10px 0 2px 5px);
.element2 {
  @include rem('border', 1px solid red);
  @include rem('padding', 10px !important);

Sample output:

.element {
  padding: 10px 0 2px 5px;
  padding: 1rem 0 0.2rem 0.5rem;
.element2 {
  border: 1px solid red;
  border: 0.1rem solid red;
  padding: 10px !important;
  padding: 1rem !important;