$opacity_1: .1 !default;
$opacity_2: .2 !default;
$opacity_3: .3 !default;
$opacity_4: .4 !default;
$opacity_5: .5 !default;
$opacity_6: .6 !default;
$opacity_7: .7 !default;
$opacity_8: .8 !default;
$opacity_9: .9 !default;
$opacity_10: 1 !default;
$opacity: (
  opacity_1: $opacity_1,
  opacity_2: $opacity_2,
  opacity_3: $opacity_3,
  opacity_4: $opacity_4,
  opacity_5: $opacity_5,
  opacity_6: $opacity_6,
  opacity_7: $opacity_7,
  opacity_8: $opacity_8,
  opacity_9: $opacity_9,
);