my-nvim-config/vps/plugin/neoscroll.lua

local neoscroll = require("neoscroll")

-- Keep cursor away from the edges
vim.opt.scrolloff = 8

neoscroll.setup({
    -- All these keys will be mapped to their corresponding default scrolling animation
    mappings = { '<C-u>', '<C-d>', '<C-b>', '<C-f>',
        '<C-y>', '<C-e>', 'zt', 'zz', 'zb' },
    hide_cursor = true,            -- Hide cursor while scrolling
    stop_eof = true,               -- Stop at <EOF> when scrolling downwards
    respect_scrolloff = false,     -- Stop scrolling when the cursor reaches the scrolloff margin of the file
    cursor_scrolls_alone = true,   -- The cursor will keep on scrolling even if the window cannot scroll further
    easing_function = nil,         -- Default easing function
    pre_hook = nil,                -- Function to run before the scrolling animation starts
    post_hook = nil,               -- Function to run after the scrolling animation ends
    performance_mode = false,      -- Disable "Performance Mode" on all buffers.
    easing_function = "quadratic", -- Default easing function
})

local keymap = {
    ["<C-u>"] = function() neoscroll.ctrl_u({ duration = 250 }) end,
    ["<C-d>"] = function() neoscroll.ctrl_d({ duration = 250 }) end,
    ["<C-b>"] = function() neoscroll.ctrl_b({ duration = 450 }) end,
    ["<C-f>"] = function() neoscroll.ctrl_f({ duration = 450 }) end,
    ["<C-y>"] = function() neoscroll.scroll(-0.1, { move_cursor = false, duration = 100 }) end,
    ["<C-e>"] = function() neoscroll.scroll(0.1, { move_cursor = false, duration = 100 }) end,
    ["zt"]    = function() neoscroll.zt({ half_win_duration = 250 }) end,
    ["zz"]    = function() neoscroll.zz({ half_win_duration = 250 }) end,
    ["zb"]    = function() neoscroll.zb({ half_win_duration = 250 }) end,
}

local modes = { 'n', 'v', 'x' }
for key, func in pairs(keymap) do
    vim.keymap.set(modes, key, func)
end