materio-d8/web/themes/custom/materiotheme/assets/styles/base/_colors.scss

$transparent-bg: rgba(255,255,255, 0.95);
$transparent-bg-blk: rgba(0,0,0, 0.75);

$color-base:#69cdcf;
$color-showrooms:#50aa3c;
$color-blabla:#9458aa;
$alpha: 0.90;
$color-base-transparent: change-color($color-base, $alpha: $alpha);
$color-showrooms-transparent: change-color($color-showrooms, $alpha: $alpha);
$color-blabla-transparent: change-color($color-blabla, $alpha: $alpha);