This is a custom version of the original Ayu colorscheme.
Plug 'chinmaydd/ayu-custom-cdd' " or other package manager
"...
set termguicolors " enable true colors support
let ayucolor="light" " for light version of theme
let ayucolor="mirage" " for mirage version of theme
let ayucolor="dark" " for dark version of theme
colorscheme ayu