What's wrong with admixture?

Question

Sass

@mixin debug($background, $outline){
    height: 100vh;
    position: fixed;
    width: 100%;
    
    > div{
        height: inherit;
        @include container();
        
        > div{
            height: inherit;
            @include row-flex();
            
            > div{
                @include col();
                @include size(1);
                height: inherit;
                outline: $outline;
                background: $background;
            }
        }
    }
}

@include debug (rgba (0, 0, 0, 0.5), 1px solid red);

As a result, I get an error:
Error: Properties are only allowed within rules, directives, mixin includes, or other properties.
Indicates:
>> height: 100vh;

Answer 1

@include must be used inside rules