Blur Mixin

Mixin de desfoque simples, funcionará no Chrome 28+, Safari 6+, IE6-9, Firefox 10+

@mixin blur($px: 0) {
    -webkit-filter: blur(#{$px}px) !important;
    -ms-filter: blur(#{$px}px) !important;
    -moz-filter: blur(#{$px}px) !important;
    filter: url("data:image/svg+xml;utf8,<svg >);
    filter:progid:DXImageTransform.Microsoft.Blur(PixelRadius='#{$px}');
}