Box sizing

Reset the box-sizing

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

*,
*:before,
*:after {
  .box-sizing(border-box);
}

.screenreaders-only { 
  clip: rect(1px, 1px, 1px, 1px);
  position: absolute;
  border:0;
}