roundmoled.theme.css

Installing for BetterDiscord

Download roundmoled.theme.css (inside the BetterDiscord folder)
Paste it into your themes folder (usually found at AppData\Roaming\BetterDiscord\themes or at ~/.config/BetterDiscord/themes/ if you're on Linux)

Installing for Powercord

cd powercord/src/Powercord/themes && git clone https://github.com/Rayrsn/RoundNotmoled

Theme is easy to edit from the main.css file, everything is very self-explanatory

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