It is planned that when we next update the styles of the diary view, a night mode will be added just like the iPad app.
We have the designs all but completed and there will even be an on/off switch to Classic mode!
This might not be released until 2018 but we'll keep you posted.
I was just thinking about night mode and seen this convo 4 years old.
Is night mode now available in browser/ desktop version? If so how can I activated please?