.vm-row {
  padding: 0 16px;
}
.vm-col {
  float: left;
  box-sizing: border-box;
}

.generate-col(24);
.generate-col(@n, @i: 1) when (@i =< @n) {
  .vm-col-@{i} { width: @i * 100% / 24; }
  .vm-col-offset-@{i} { margin-left: @i * 100% / 24; }
  .generate-col(@n, (@i + 1));
}