To make mixins more clear when working in big project it is wise to specify a keyword.Then it doesn’t matter in which order you pass in the arguments.
@mixin assemble($bg: #fff, $pad: 10px) { background: $bg; border: 1px solid #ccc; padding: $pad; } .factory { @include assemble(); } .highrise { @include assemble($bg: #797979, $pad: 20px); }