I tried this and it worked for me:
.sprintrFeedback__sidebar_button:after {
content: "F e e d b a c \A k";
white-space: pre-wrap;
}
You could also rotate the content without the spaces like this:
.sprintrFeedback__sidebar_button:after {
content: "Feedback";
transform: rotate(90deg);
}
With a little changes to the heights/widths and backround I managed to make it look like this:
Hope this helps!
Have you tried to add an extra space to your content:
“F e e d b a c k ”
This just might get the c and k on a separate line.
You could use
.sprintrFeedback__sidebar_button:after {
content: "F e e d b a c k";
word-break: break-all;
}
and setting width to 1em. This will make the word be split into each seperate letter (https://css-tricks.com/almanac/properties/w/word-break/). However, my experience is that word-breaks never seem to do exactly what you want, so if any of the above answers works for you, use those.
Cheers