message: fix(Button): text align center
diff: @button-normal-font-size: @font-size-md;
  @button-large-height: 50px;
  @button-default-height: 44px;
  -@button-default-line-height: 1.5;
  +@button-default-line-height: 1.2;
  @button-default-font-size: @font-size-lg;
  @button-default-color: @text-color;
  @button-default-background-color: @white;
  