operation_wx/miniprogram_npm/tdesign-miniprogram/common/style/theme/_font.wxss

page,
.page {
  --td-font-family: PingFang SC, Microsoft YaHei, Arial Regular;
  --td-font-family-medium: PingFang SC, Microsoft YaHei, Arial Medium;
  --td-font-size: 20rpx;
  --td-font-size-xs: var(--td-font-size);
  --td-font-size-s: 24rpx;
  --td-font-size-base: 28rpx;
  --td-font-size-m: 32rpx;
  --td-font-size-l: 40rpx;
  --td-font-size-xl: 72rpx;
}