Send the following on WhatsApp
Continue to ChatOS X Yosemite beta: Donkere weergave activeren (Dark Mode) https://www.appletips.nl/os-x-yosemite-beta-activeer-de-donkere-weergave-dark-mode/
OS X Yosemite beta: Donkere weergave activeren (Dark Mode) https://www.appletips.nl/os-x-yosemite-beta-activeer-de-donkere-weergave-dark-mode/