imathis

// Create a simple top to bottom linear gradient with a background-color backup
// The first argument, $color will be output as background-color: $color
//
// This yields a gradient that is 5% brighter on the top and 5% darker on the bottom 
//
//     +gradient-bg(#777)
//
// This yeilds a gradient where the bright and dark colors are shifted 10% from the original color.
// If you don't specify a third argument it will assign this value for the darkness too, keeping the gradient even.
//