@mixin placeholder ($attribute, $value) {
	::-webkit-input-placeholder { 
        #{$attribute}: $value; 
    } // WebKit browsers
}

@mixin square($size) {
    @include size($size, $size);
}

@mixin d($name) { & ._#{$name} { @content; } }

@mixin m($name) { & .-#{$name}  { @content; } }