How to make the gutter icons looks like in readme

[Aneeqasif]

Feature description

so this how my current config looks like there are some things that i dont know how to configure being new to neovim

1- how can i make those + , - icons looks like arrows as u showed
2- how can i make the background of preview window a bit light or darker , i dont want to apply a specific color cz i have to reconfigure it each time i change colorsheme so if it changes dynamically with colorscheme it will be ideal
3- make the background color of thin line behin + and - symbols in left side gutter of neovim the normal default background insread of the light background

Describe the solution you'd like

Additional context

No response

[rockyzhang24]

1. Please check this pinned issue How can I make it look equal to its configuration #4

2. To change the highlights of the preview window, you should use winhighlight. For example:

ufo.setup({
  preview = {
    win_config = {
      -- Link the background highlight group of the preview window to the background of the editor
      winhighlight = 'Normal:Normal',
    },
  },
})

Regarding how to config winhighlight, please see :h 'winhighlight'.
However, (neo)vim can not change highlights dynamically. To set a highlight, either define a new highlight group or link to an existing one. See :h highlight.

3. Set this FoldColumn highlight group. See :h hl-FoldColumn and :h nvim_set_hl().