message: style(Toast): add transition
diff: align-items: center;
  justify-content: center;
  box-sizing: content-box;
  + transition: all @animation-duration-fast;
  // hack for avoid max-width when use left & fixed
  width: @toast-default-width;
  font-size: @toast-font-size;
  line-height: @toast-line-height;
  - // allow newline charactor
  + // allow newline character
  white-space: pre-wrap;
  text-align: center;
  word-wrap: break-word;
  