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// Hexadecimal Alpha Colour function
@function hda($hexdec: null, $alpha: 1)
@if $hexdec == null {
// throw error if no value supplied for $hexdec
@error "$hexdex cannot be null: was, NULL";
} @else {
// evaluate input
@if $alpha >= 1 {
// return plain hexadecimal value if $alpha is greater than or equal to 1.
@return $hexdec;
} @else {
// otherwise return an rgba value with an alpha value.
@return rgba($hexdec, $alpha);
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