For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators:Wine:STABLE/openSUSE_Leap_15.1/Emulators:Wine:STABLE.repo
zypper refresh
zypper install wine-gecko
For openSUSE Leap 15.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators:Wine:STABLE/openSUSE_Leap_15.0/Emulators:Wine:STABLE.repo
zypper refresh
zypper install wine-gecko
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators:Wine:STABLE/openSUSE_Factory/Emulators:Wine:STABLE.repo
zypper refresh
zypper install wine-gecko