Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.11)
// Compass (v1.0.3)
// ----

$color: #F44336;
$darken: darken( $color, 10% );
$lighten: lighten( $color, 10% );

.box{
  background: $color;
  background: $darken; 
  background: $lighten; 
}

SassMeister-output.css

.box {
  background: #F44336;
  background: #ea1c0d;
  background: #f77066;
}