Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

//Mixin

@mixin border-radius($radius) {
  -webkit-border-radius: $radius;
  border-radius: $radius;
  background-clip: padding-box;  /* stops bg color from leaking outside the border: */
}


// variables
//Colors
$white: #fff;
$black: #000000;
$red: #ff0000;

//Font Families
$arial: Arial, Helvetica, sans-serif;
$comic: "Comic Sans MS", cursive, sans-serif;

//////////Variables end/////////////

Parent Selector 

.foo {
  @include border-radius(4px);
}
////////Nesting End///////////

SassMeister-output.css

Parent Selector
.foo {
  -webkit-border-radius: 4px;
  border-radius: 4px;
  background-clip: padding-box;
  /* stops bg color from leaking outside the border: */
}