!default_border_radius ||= 5px
 
 // Round all borders by amount
 =border-radius(!radius = !default_border_radius)
   border-radius= !radius
   -moz-border-radius= !radius
   -webkit-border-radius= !radius
 
 // Round radius at position by amount.
 // values for !vert: "top", "bottom"
 // values for !horz: "left", "right
 =border-corner-radius(!vert, !horz, !radius = !default_border_radius)
   border-#{!vert}-#{!horz}-radius= !radius
   -moz-border-radius-#{!vert}#{!horz}= !radius
   -webkit-border-#{!vert}-#{!horz}-radius= !radius
   
 =border-top-left-radius(!radius = !default_border_radius)
   +border-corner-radius("top", "left", !radius)
 
 =border-top-right-radius(!radius = !default_border_radius)
   +border-corner-radius("top", "right", !radius)
 
 =border-bottom-left-radius(!radius = !default_border_radius)
   +border-corner-radius("bottom", "left", !radius)
 
 =border-bottom-right-radius(!radius = !default_border_radius)
   +border-corner-radius("bottom", "right", !radius)
 
 // Round top corners by amount
 =border-top-radius(!radius = !default_border_radius)
   +border-top-left-radius(!radius)
   +border-top-right-radius(!radius)
 
 // Round right corners by amount
 =border-right-radius(!radius = !default_border_radius)
   +border-top-right-radius(!radius)
   +border-bottom-right-radius(!radius)
 
 // Round bottom corners by amount
 =border-bottom-radius(!radius = !default_border_radius)
   +border-bottom-left-radius(!radius)
   +border-bottom-right-radius(!radius)
 
 // Round left corners by amount
 =border-left-radius(!radius = !default_border_radius)
   +border-top-left-radius(!radius)
   +border-bottom-left-radius(!radius)