.radius(@value)
{
  -moz-border-radius: @value;
  border-radius: @value;
}

.opacity(@value)
{
  @filter: @value*100;
  opacity: @value;
  filter: alpha(opacity=@filter);
}

.box-sizing(@value)
{
  box-sizing:@value;
  -moz-box-sizing:@value;
}

.transition(@val)
{
  -webkit-transition: @val;
  transition: @val;
}

.selection(@background,@color)
{
  ::selection{ background:@background; color:@color;}
  ::-moz-selection{ background:@background; color:@color;}
}