.absolute() {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
}

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