$hamburger-width: 40px !default;
$hamburger-height: 40px !default;

$hamburger-mask-image: $icon-hamburger;
$hamburger-mask-size: 30px 24px !default;
$hamburger-background-color: null !default;

.hamburger {
    @include icon-mask(
        $icon: $hamburger-mask-image,
        $size: $hamburger-mask-size,
        $color: $hamburger-background-color,
        $width: $hamburger-width,
        $height: $hamburger-height
    );
}