As mentioned by @gregorius in this topic about the changes in the header:
The red border I find too harsh
I agree with him, we need something more subtle there.
In another reply:
I tried the same red as the deploy button (#8c101c) it became very subtle:
Screenshots stolen copied from his reply.
It looks much better.
Can we use that color? Or perhaps the red (#8f0000) from the Node-RED logo?