SASS mixins - default value for @content -

is possible define default value @content 1 arguments?

for instance like:

@mixin foo {     @content: width:100%; } 

no, @content not variable. cannot set default value it. cannot manipulate or examine it.

if alessandro's answer unsuitable needs, you'll need create mixin results desire:

@mixin foo {   color: red;   @content; }  @mixin empty-foo {   @include foo {     width: 100%;   } }  .foo {   @include foo {     border: 1px solid;   } }  .bar {   @include empty-foo; }