A theme based on Elverlara's Sweet-Mars theme [https://store.kde.org/p/1393507/]
The screenshots that you saw above were of i3+Plasma. You can install this theme on i3 without Plasma but then KDE applications wouldn't look as good.
##Requirements
Before we install the theme its necessary to setup the pre-requisite programs. I use pamac as a package manager for AUR but you can use anything such as yay. Assuming that you already have a basic i3 configuration already setup, execute the following lines of code-
pamac install rofi polybar picom-ibhagwan-git ttf-font-awesome-pro nerd-fonts-jetbrains-mono kitty cava neofetch