Preview popup style

[slothong]

Preview or blame_line popup window looks like the image below. Is this the default style? Since there’s no border and no padding, it looks strange. If this isn’t the intended behavior, could you tell me how to fix it?
I am using catppuccin (macchiato) theme

[lewis6991]

I have:

  preview_config = {
    border = 'rounded',
  },

However the default is set via winborder

Try:

vim.o.winborder='double'