How do I personalize the theta theme buttons?

[Lucashdml]

this are my configs
{
"goolord/alpha-nvim",
lazy = false,
dependencies = {
"nvim-tree/nvim-web-devicons",
"nvim-lua/plenary.nvim",
},
config = function()
local alpha = require ("alpha")
local config = require("alpha.themes.theta").config
-- there's no name, access via index
config.layout[2].val = {
[[ ]],
[[ ]],
[[ ]],
[[ ]],
[[  ]],
[[ ████ ██████ █████ ██ ]],
[[ ███████████ █████  ]],
[[ █████████ ███████████████████ ███ ███████████ ]],
[[ █████████ ███ █████████████ █████ ██████████████ ]],
[[ █████████ ██████████ █████████ █████ █████ ████ █████ ]],
[[ ███████████ ███ ███ █████████ █████ █████ ████ █████ ]],
[[ ██████ █████████████████████ ████ █████ █████ ████ ██████ ]],
[[ ]],
[[ ]],
[[ ]],
}

  alpha.setup(config)
end,

},