message: style(NumberKeyboard): improve text size adjust
diff: &__header {
  position: relative;
  + display: flex;
  + align-items: center;
  + justify-content: center;
  box-sizing: content-box;
  height: @number-keyboard-title-height;
  padding-top: 6px;
  color: @number-keyboard-title-color;
  font-size: @number-keyboard-title-font-size;
  - line-height: @number-keyboard-title-height;
  - text-align: center;
  }
  &__title {
  &__close {
  position: absolute;
  right: 0;
  + height: 100%;
  padding: @number-keyboard-close-padding;
  color: @number-keyboard-close-color;
  font-size: @number-keyboard-close-font-size;
  