@mixin sk-arrow-down($size, $color: #666) {
width:0; height:0; border-top: $size solid $color; border-right: $size solid transparent; border-left: $size solid transparent;
}
@mixin sk-arrow-right($size, $color: #666) {
width:0; height:0; border-bottom: $size solid transparent; border-top: $size solid transparent; border-left: $size solid $color;
}