message: Separator: simplify css
diff: background: transparent;
  }
  +.Separator:not(.Separator--wide) .Separator__in {
  + margin-left: 16px;
  + margin-right: 16px;
  +}
  +
  +/**
  + * iOS
  + */
  .Separator:not(.Separator--wide).Separator--ios .Separator__in {
  margin-left: 12px;
  margin-right: 12px;
  }
  -
  -.Separator:not(.Separator--wide).Separator--android .Separator__in,
  -.Separator:not(.Separator--wide).Separator--vkcom .Separator__in {
  - margin-left: 16px;
  - margin-right: 16px;
  -}
  