@input-border-radius: .rounded();
or
@h1: .font-size(46) // This pulls from the rem calculator mixin.

.fontstyling {
   font-weight: bold;
   color: black;
}

h1 {
   font-size: 46px;
   .fontstyling;
}

h2 {
   font-size: 38px;
   .fontstyling;
}