My co-maintainer is 50 or 60 years younger than I am 
and can read the small notifications with the red font wonderfully.
Since I don’t want to turn my head so fast to look into the lower right corner anymore I also increased the display time 
Since I also use monitors that don’t use the default resolution, here’s an example of how you can customize it to your needs.
Edit the .config/mako/config
My config
anchor=bottom-right
font=monospace 12
background-color=#285577FF
text-color=#FFFFFFFF
width=300
height=600
max-history=10
margin=0,20,20
padding=5
border-size=5
border-color=#4C7899FF
border-radius=3
default-timeout=20000
group-by=summary
icons=1
[grouped]
format=<b>%s</b>\n%b
# makoctl reload // Load last config
# makoctl restore // Load last notify
Feel free to post your configs. 