Mixin for stylus that creates a solid drop shadow effect for a given distance and color. Usage box-shadow solidShadow(1..10, #000) Remember the 1..10 part, it's important.
solidShadow(size, color = #000)
shadows = '0px 0px #000'
for n in size
shadows += ', ' + n + 'px ' + n + 'px '
shadows += color
return unquote(shadows)