Dark thema (dark blue), slightly transparent, with a lot of Teal-Color details, which makes this theme very pleasant and harmonious.
This theme will install as dependencies:
"Harmony" Plasma theme: Here
"Harmony" Aurorae theme: Here
"Harmony-Dark" Colorscheme: Here
"Harmony V.3" Splashscreen: Here
"Breeze Chameleon Dark" Icons: Here
The author of the wallpaper (Splashscreen), charlie-henson: Here