.round-corners (@radius: 5px) {
  -moz-border-radius: @radius;
  -ms-border-radius: @radius;
  -o-border-radius: @radius;
  -webkit-border-radius: @radius;
  border-radius: @radius;
}
.background-clip () {
  -moz-background-clip: padding; /* for Mozilla browsers*/
  -webkit-background-clip: padding;   /* Webkit */
  background-clip: padding-box; /*  browsers with full support */
}
.box-sizing(@sizing:border-box) {
  -webkit-box-sizing: @sizing;
  -moz-box-sizing: @sizing;
  box-sizing: @sizing;
}
.gradient(@color, @start, @stop) {
  background-color: @color;
  filter:progid:DXImageTransform.Microsoft.gradient(gradientType=0, startColorstr='@{start}', endColorstr='@{stop}');
  background-image:-webkit-gradient(linear,
                                    50% 0%,
                                    50% 100%,
                                    color-stop(0%, @start),
                                    color-stop(100%, @stop));
  background-image:-webkit-linear-gradient(to bottom,
                                           @start 0%,
                                           @stop 100%);
  background-image:-moz-linear-gradient(to bottom,
                                        @start 0%,
                                        @stop 100%);
  background-image:-o-linear-gradient(to bottom,
                                      @start 0%,
                                      @stop 100%);
  background-image:linear-gradient(to bottom,
                                   @start 0%,
                                   @stop 100%);
}
.box-shadow(@x, @y, @blur, @color, @inset) when (@inset = true) {
  -webkit-box-shadow: @x @y @blur @color inset;
  -moz-box-shadow: @x @y @blur @color inset;
  box-shadow: @x @y @blur @color inset; 
}
.box-shadow(@x, @y, @blur, @color, @inset) when (@inset = false) {
  -webkit-box-shadow: @x @y @blur @color;
  -moz-box-shadow: @x @y @blur @color;
  box-shadow: @x @y @blur @color; 
}