css - Splitting Multiple LESS arguments -

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i have mixin:

.gradient(@alpha, ...) {     @r: extract(@arguments,1);     @g: extract(@arguments,2);     @b: extract(@arguments,3);      background: -moz-linear-gradient(top,  rgba(@r,@g, @b, .2) 0%, rgba(0,0,0,@alpha) 100%);     background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(@r,@g, @b, .2)), color-stop(100%,rgba(0,0,0,@alpha)));     background: -webkit-linear-gradient(top,  rgba(@r,@g, @b, .2) 0%,rgba(0,0,0,@alpha) 100%);     background: -o-linear-gradient(top,  rgba(@r,@g, @b, .2) 0%,rgba(0,0,0,@alpha) 100%);     background: -ms-linear-gradient(top,  rgba(@r,@g, @b, .2) 0%,rgba(0,0,0,@alpha) 100%);     background: linear-gradient(to bottom,  rgba(@r,@g, @b, .2) 0%,rgba(0,0,0,@alpha) 100%); }

setting color , alpha:

@rgbcolor: 221,73,50; @gradientalpha: 0.3;

using it:

.wrapper .gradient { .gradient( @gradientalpha, @rgbcolor ); }

returns:

syntaxerror: error evaluating function `rgba`: color functions take numbers parameters

seems work fine until add alpha param. i've been scouring web 24hrs can't find explains why error creep up. can shed light on this?

much appreciated!

edit:

as per seven-phrases-max in comments, tried following:

.gradient(...) {     @color: extract(@arguments,1);     @alpha: extract(@arguments,2);      background: -moz-linear-gradient(top,  fade(@color, .2) 0%, color(0,0,0,@alpha) 100%);     background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,fade(@color, .2)), color-stop(100%,fade(0,0,0,@alpha)));     background: -webkit-linear-gradient(top,  fade(@color, .2) 0%,fade(0,0,0,@alpha) 100%);     background: -o-linear-gradient(top,  fade(@color, .2) 0%,fade(0,0,0,@alpha) 100%);     background: -ms-linear-gradient(top,  fade(@color, .2) 0%,fade(0,0,0,@alpha) 100%);     background: linear-gradient(to bottom,  fade(@color, .2) 0%,fade(0,0,0,@alpha) 100%); }  @mycolor: 221,73,50; @gradientalpha: 30%;  .wrapper .gradient { .gradient(@mycolor, @gradientalpha); }

but returns following error:

syntaxerror: error evaluating function `fade`: object #<object> has no method 'tohsl'


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