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@mixin border-radius ( $value: 3px ) {
  -webkit-border-radius: $value;
  -moz-border-radius: $value;
  border-radius: $value;
  
  // keeps background from busting out of border 
  -webkit-background-clip: padding-box;
  -moz-background-clip: padding;
  background-clip: padding-box;
}