message: add M & S sizes on button
diff: font-size: rem(14px);
  }
  }
  +
  + &-M {
  + .zh-button {
  + padding: rem(6px 12px);
  + font-weight: 500;
  + font-size: rem(14px);
  + }
  + }
  +
  + &-S {
  + .zh-button {
  + padding: rem(4px 8px);
  + font-weight: 500;
  + font-size: rem(12px);
  + }
  + }
  }
  &.zh-button-type {
  