Modified Theme: "Sugar Dark for SDDM" by author: MARIANARLT, for Plasma Theme "Purple", which you can download: Here
If you do not want virtual keyboard, do the following in:
Root / etc / sddm.conf
In [general] section, add: InputMethod=
It should look like this:
sddm: 0.18.0, qt5: 5.11, & qt5-quickcontrols: 5.11.2
Make sure these are up to date!
The author of the wallpaper: charlie-henson: Here