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CSS

Sass Calculation Formula Mixin

I'm want to create a mixin in Sass to vertically align an element within a div. My idea is to calculate the difference between the divs height and the nested elements height, then divide it by two which would be used as top and bottom padding.

@mixin vertical_align($outterHeight, $innerHeight){

padding-top: calc($outterHeight - $innerHeight / 2);
padding-bottom: calc($outterHeight - $innerHeight / 2);

}


input{
  height: 40px;
}

i{
  height: 28px;
}

i{
   @include vertical_align(40px,28px);
  }

I don't have have much experience using mixins and this doesnt work. Can anyone point me in the right direction?